Condensation curable silicone compositions

Abstract

This disclosure relates to condensation curable room temperature vulcanisable (RTV) silicone compositions comprising physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates, and in particular to sealants, coatings and adhesives made from said condensation curable room temperature vulcanisable (RTV) silicone compositions comprising said physically recycled and / or reclaimed HTV elastomeric silicone rubber particulates, as well as methods for preparing said compositions and sealants, coatings, adhesives and the like.

Description

[0001]CONDENSATION CURABLE SILICONE COMPOSITIONS This disclosure relates to condensation curable room temperature vulcanisable (RTV) silicone compositions comprising physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates, and in particular to sealants, coatings and adhesives made from said condensation curable room temperature vulcanisable (RTV) silicone compositions comprising said physically recycled and / or reclaimed HTV elastomeric silicone rubber particulates, as well as methods for preparing said compositions and sealants, coatings, adhesives and the like. Condensation curable room temperature vulcanisable (RTV) organosiloxane compositions which cure to elastomeric solids are well known and such compositions cure at room temperature in the presence of moisture and are usually obtained by mixing a polydiorganosiloxane based polymer having hydroxyl or hydrolysable reactive groups, with a suitable silane (or siloxane) based cross- linking agent in the presence of one or more fillers and a curing catalyst. These compositions are typically either prepared in the form of one-part compositions curable upon exposure to atmospheric moisture at room temperature or two-part compositions curable upon mixing at room temperature and pressure. Dependent on the ingredients, such curable compositions may be used as sealants, coatings and / or adhesives. In the case of use as a sealant, it is important that the composition has a blend of properties which render it capable of being applied as a paste to a joint between substrate surfaces where it can be worked, prior to curing, to provide a smooth surfaced mass which will remain in its allotted position until it has cured into an elastomeric material adherent to the adjacent substrate surfaces. Typically, sealant compositions are designed to cure quickly enough to provide a sound seal within several hours but at a speed enabling the applied material to be tooled into a desired configuration shortly after application. The resulting cured sealant is generally formulated to have a strength and elasticity appropriate for the joint concerned. Compositions as hereinbefore described having lower viscosities may be utilised as coatings and / or adhesives in a wide variety of applications e.g., in weatherproofing and / or construction applications. For example, a wide variety of weatherproof coatings / adhesives may be used in both new building and remedial construction applications as barrier systems. Three alternative routes to making silicone elastomeric materials other than condensation cured silicone elastomeric materials involve the production of silicone rubber via hydrosilylation (addition) cure process using a platinum family catalyst, free-radical cure processes using peroxide catalysts, and / or by UV cure processes using photoinitiators or photo-catalysts. For the sake of this disclosure these are referred to collectively as high temperature vulcanization (HTV) materials. However, it is to be appreciated that in certain instances, despite the name, HTV materials can be cured at ambient or even sub-ambient conditions by an appropriate selection of catalysts, stabilizers and accelerants. However, the preparation of HTV and RTV elastomers involves very different cure chemistries and as such whilst potentially attractive, these different cure chemistries create issues for preparing hybrid HTV and RTV elastomers, as, for example, the condensation catalysts used for RTV cure can poison platinum (Pt) catalysts in the hydrosilylation cure process and potentially create major safety hazards associated with hydrogen ( H2) generation. Therefore, mixing uncured HTV and RTV materials in a single composition is challenging and potentially dangerous. Given they are thermoset materials, silicone elastomers cannot be melted and reprocessed into polymers which are suitable to be used in their intended applications and as such it is difficult to provide an effective recycling and / or reclaiming alternative to incineration or landfilling as an end- of-life option to meet the desired “carbon footprint” reduction targets increasingly found in the manufacturing industry today. There are two main method types for recycling / reclaiming elastomeric materials namely by “chemical processes” such as pyrolysis, chemical degradation and chemical reversion and by “physical processes”, i.e., mechanical processes such as mechanical reclaiming, thermo-mechanical reclaiming and cryo-mechanical reclaiming and wet / solution grinding methods. Given silicone elastomers are thermoset materials chemical recycling of silicone elastomers is not ideal because reclaiming / recycling requires significant separation and often generates solid residues that are typically of low value. That said, physically recycled and / or reclaimed silicone elastomeric particulates are typically incorporated as fillers in combination with a binder material that serves as an encapsulating matrix. The binder can be either a new silicone composition or an organic polymer material that can also be combined with an inorganic mixture such as an asphaltic or cementitious mixture and serves the function of entrapping and / or encapsulating the discrete particulates. However, physically recycled and / or reclaimed silicone elastomeric particulates have not been considered useful in higher value applications because of their inconsistency and variability in performance and therefore the value proposition for such recycled and / or reclaimed silicone elastomeric particulates is poor with the particulates only being deployed in lower value applications, lowering economic and technological incentives for reuse, as a result of: (i) poor incorporation of the silicone elastomeric particulates within the binder matrix; (ii) Interfacial adhesion and binding between the silicone elastomeric particulates and matrix being typically poor such that the preformed silicone elastomeric particulates can serve as defects in the matrix, creating voids, surface protrusions or other heterogeneities in the matrix, resulting in inferior properties to new silicone elastomers. A more sustainable condensation curable silicone elastomer composition is provided. It has a lower carbon footprint by enabling the replacement of a significant amount of ingredients from the condensation curable silicone elastomer composition (greater than (> 10 weight % (wt. %)) with physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates as discussed below. There is provided a condensation curable silicone elastomer composition capable of cure to an elastomeric material, the composition comprising (i) Organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, wherein at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule having a viscosity of from 750 to 150,000mPa.s at 25oC, (ii) a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in organopolysiloxane polymer; (iii) One or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; (iv) a condensation cure catalyst; and (v) physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, which physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) have been penetrated and swollen by an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC. There is also provided a method of preparing a condensation curable silicone elastomer composition comprising the steps of (1) mixing physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, with an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC for a suitable period to enable said organopolysiloxane polymer swelling agent (v)(ii) to penetrate and swell said physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates (v)(i) to form component (v); (2) forming a step (2) mixture comprising component (v), at least part of component (i) and optionally one or more of components (ii), (iii) and / or (iv) wherein (i) is organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, wherein at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule having a viscosity of from 750 to 150,000mPa.s at 25oC, (ii) is a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in organopolysiloxane polymer (i) (iii) is one or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; and (iv) is a condensation cure catalyst; (3) mixing the step (2) mixture with the remainder of components (ii), (iii) and / or (iv) wherein to produce a condensation curable silicone elastomer composition. In one embodiment step (1), step (2) and optionally step (3) may be undertaken together as a single step. The condensation curable silicone elastomer composition may subsequently be applied onto and / or into a substrate and then cured for a predetermined time. There is also provided herein a substrate on or in which is a cured product of a condensation curable silicone elastomer composition in accordance with the above process. There is also provided a use of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, which physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) have been penetrated and swollen by an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC; in a condensation curable silicone elastomer composition otherwise comprising: (i) an organopolysiloxane polymer having not less than two silicon-bonded hydroxyl or hydrolysable groups per molecule and a viscosity of from 1,000 to 75,000 mPa.s at 25oC, (ii) a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in organopolysiloxane polymer (i); (iii) One or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; and (iv) a condensation cure catalyst; in the preparation of condensation curable silicone elastomer composition capable of cure to an elastomeric material. There is also provided a method for filling a space between two or more than two substrates, so as to create a seal therebetween, comprising: a) providing a condensation curable silicone elastomer composition as hereinbefore described, and either b) applying the condensation curable silicone elastomer composition to a first substrate, and bringing a second substrate in contact with the silicone composition that has been applied to the first substrate, or c) filling a space formed by the arrangement of a first substrate and a second substrate with the condensation curable silicone elastomer composition and curing the condensation curable silicone elastomer composition. The terms “recycling” and “reclaiming” as used herein are intended to define the function of recovering and converting waste materials into new materials and usable products. Unless otherwise indicated all viscosity measurement given are measured using any suitable means e.g., a Modular Compact Rheometer (MCR) 302 Anton Paar GmbH of Graz, Austria using the most suitable settings and plates for the viscosity concerned, for example using a 25mm diameter cone and plate fixture with the cone having a 1.988° cone angle, and 104 micrometer truncation at a shear rate of 1s-1. This provides a more sustainable condensation curable silicone elastomer composition offering a lower carbon footprint to the user by enabling replacement of a significant amount of new silicone compositions, e.g., 10wt. % or more of the composition, with physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i), from a variety of sources, sufficiently compatible with said condensation curable silicone elastomer compositions. Hence, this solution provides both the benefit, of reducing the carbon footprint associated with producing new condensation curable silicone elastomer compositions, as well as providing a high value alternative to incineration or landfilling as an end-of-life option for the silicone elastomers used in the preparation of the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i). Examples of recycled and / or reclaimed materials that can be reduced to such preformed silicone elastomeric particulates include, but are not restricted to, post-industrial scrap or waste rubber, pre-consumer scrap or waste rubber, or post-consumer scrap or waste rubber. For the avoidance of doubt the term average unswollen particle size is intended to mean the average particle size of the physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates physically recycled and / or reclaimed(v)(i) used herein subsequent to mechanically recycling the source of the silicone elastomer particulates (v)(i) and prior to mixing with a “swelling agent” otherwise identified as component (v)(ii) and / or organopolysiloxane polymer (v)(ii). The ability to penetrate and swell the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) with an organopolysiloxane polymer (v)(ii), as described above, results in the formation of interpenetrating networks between the new silicone composition and the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i), resulting in of the presence of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) in a condensation cured elastomeric material without substantial degradation in mechanical properties (and potentially even “upcycling” through improved properties) of the resulting elastomeric material once cured. This has a direct benefit on the Life Cycle Assessment (LCA) of the condensation curable silicone elastomer compositions by replacing carbon dioxide equivalence which goes into the making of the ingredients in the condensation curable silicone elastomer composition with a recycled material that does not require capital and energy-intensive molecular level purification steps like distillation. Physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates (v)(i) The physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) may be derived from any suitable source such as post-industrial scrap or waste rubber, pre-consumer scrap or waste rubber, or post-consumer scrap or waste rubber obtained from for example silicone rubber elastomers prepared from hydrosilylation curable compositions, peroxide cure compositions by e.g., free-radical cure processes or UV cure processes using photoinitiators or photo-catalysts, which elastomers may have been used in applications such as airbag coatings, gaskets and seals adhesives, coatings, foams, molded rubber articles, hoses and tubing like medical tubing, encapsulants and potting agents or the like. The original elastomer and the resulting physically recycled and / or reclaimed silicone rubber particulates may be dense or have inclusions or voids, as in foams. When the origin of the cured elastomeric particulates is unknown a priori, the cured silicone material from which they originates or the physically recycled or reclaimed particulates can be characterized by a variety of known methods to ascertain the composition including spectroscopic techniques including infrared techniques such as Fourier transform infrared (FTIR) spectroscopy, attenuated total reflectance infrared spectroscopy (ATR-IR), infrared microscopy, Raman spectroscopy, Raman microscopy, solid state nuclear magnetic resonance (NMR) spectroscopy; chemical derivatization and titration techniques; chemical digestion followed by chromatography such as gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), liquid chromatography (LC), or by a variety of known elemental or ion analysis techniques such as inductively coupled plasma-optical emission spectroscopy (ICP-OES), x-ray fluorescence (XRF), and neutron activation analysis (NAA). Physical recycling methods are utilised to transform silicone elastomers into powders, granules, crumbs, or pellets (referred to collectively herein as “particulates”). For the avoidance of doubt and the sake of this disclosure, physically (mechanically) recycled / reclaimed particulates have their original crosslinked structure preserved, whereas chemically recycled materials would not. The physically recycled and / or reclaimed cured silicone elastomer particulates (v)(i) are prepared by any suitable physical recycling method e.g., by grinding, milling, or pulverizing methods for example by mechanical reclaiming, thermo-mechanical reclaiming, cryo-mechanical reclaiming, and wet / solution grinding. Specific examples of methods which may be utilised to generate the particulates include, for the sake of example, cryomilling (at liquid nitrogen temperatures), using milling equipment known in the art such as ball mills, pin mills, and the like, tornado milling (which can be done at either ambient or cryogenic temperatures in the solid state) and wet jet milling (e.g., wet jet) where the rubber is pulverized by an intense water stream. The physically recycled and / or reclaimed cured silicone elastomer particulates (v)(i) have an average particle size of 1 mm or less. Smaller particle sizes are preferable to minimize stress- concentrating defects in the new article, but satisfactory performance has been achieved even for relatively large 1 mm sized milled physically recycled and / or reclaimed cured silicone elastomer particulates (v)(i). In one embodiment the average particle size of the physically recycled and / or reclaimed cured silicone elastomer particulates (v)(i) was 600µm or less, alternatively the average particle size of the preformed silicone elastomeric particulates was 500µm or less, alternatively the average particle size of the preformed silicone elastomeric particulates was 400µm or less, alternatively the average particle size of the preformed silicone elastomeric particulates was 300µm or less, alternatively the average particle size of the preformed silicone elastomeric particulates was 200µm or less. Particulates of an acceptable size may be obtained by mechanical screening through a sized mesh. Smaller particles are obtained by filtering through increasingly small meshes. If the silicone elastomer to be made into particulates is adhered to another material in prior use, they are preferably separated or delaminated. For example, in the case of wanting to recycle airbag articles the first step is to recover the silicone elastomer by delaminating same from the textile support. After which the resulting coating may be broken down into particulates using one of the processes listed above. However, it is to be understood that delamination or separation of silicone materials from certain substrates or articles may be imperfect and can lead to some residual minority fraction of adventitious non-silicone contaminants in the resulting particulates, such as small fragments of fabric or plastic substrates that may be present in quantities less than 10 wt. % of a particulate mixture, preferably 5 wt. % or less, with less being desirable. Physical recycling and / or reclamation using one or more of the different methods described above offers 1) the advantage of being able to reuse of inorganic fillers, 2) the ability to incorporate contaminated feedstocks from deployed silicone elastomers, and the ability to tolerate residual Si-H from hydrosilylation cured silicone elastomers without needing to undergo the depolymerization, neutralization, filtration, and stripping steps associated with chemical recycling processes. In one example, cured silicone rubber samples were shredded with a paper shredder or cut with scissors until they were of a predetermined size e.g., less than 2cm particle size before being fed to a mill. The shredded / cut silicone rubber samples can be mixed with dry ice (the dry ice was crushed to a powder using mortar and pestle) in an approximately 1:1 weight ratio in order to reduce the temperature of the silicone rubber and help stiffen it for milling. The silicone rubber / dry ice mixture can then be fed into a suitable mill using a knife blade rotor rotating at an rpm of greater than (>) 10,000. The silicone rubber can then be allowed to leave the milling chamber through a stainless- steel screen when the rubber was cut finer than the hole size of the screen, e.g., a 2-3 mm diameter round holes could be used for a first pass. The silicone rubber milled in the first pass can then undergo a second pass with dry ice again as before and be fed through the MikroTMUMP-B mill for a second pass this time using a 1mm slotted screen. If desired for more accurate particle size measurements samples can be measured using laser diffraction with e.g., a Beckman CoulterTMLS 13320 Particle Size Analyzer with the Tornado (dry) module commercially available from Beckman Coulter Inc., relying on Beckman CoulterTMsoftware to deconvolute the diffraction signal to a particle size distribution determined using Fraunhofer diffraction model. Penetration and Swelling of the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) with an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC. As discussed above the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) in the condensation curable silicone elastomer composition capable of cure to an elastomeric material, herein has an average unswollen particle size of less than 1 mm. However, the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are not just mixed directly into a standard condensation curable silicone elastomer composition to be encapsulated therein as the composition cures. They are initially immersed and / or soaked in a low viscosity organopolysiloxane polymer having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC (v)(ii), alternatively a viscosity of from 100 to 13,000 mPa.s at 25oC (v)(ii), alternatively a viscosity of from 100 to 10,000 mPa.s at 25oC (v)(ii), alternatively a viscosity of from 100 to 7,500 mPa.s at 25oC (v)(ii), alternatively a viscosity of from 100 to 5,000 mPa.s at 25oC (v)(ii), alternatively a viscosity of from 100 to 2,000 mPa.s at 25oC (v)(ii) for a suitable period of time. The viscosity may be measured using any suitable means e.g., a Modular Compact Rheometer (MCR) 302 Anton Paar GmbH of Graz, Austria using the most suitable settings and plates for the viscosity concerned, for example using a 25mm diameter cone and plate fixture with the cone having a 1.988° cone angle, and 104 micrometer truncation at a shear rate of 1s-1. The suitable period of time may be at least 1 hour, alternatively at least 12 hours, alternatively at least 24 hours, alternatively at least 48 hours. This enables said organopolysiloxane polymer swelling agent (v)(ii) to penetrate and swell said physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates (v)(i) to form component (v). Alternatively, component (v) may be prepared by swelling elastomer particulates (v)(i) in a part of the condensation curable silicone elastomer composition containing component (v)(ii). In such a case swelling can occur throughout the suitable period of time which in this instance is the period during which particulates (v)(i) are stored in the presence of component (v)(ii) in said part of the condensation curable silicone elastomer composition containing component (v)(ii), the organopolysiloxane polymer swelling agent (v)(ii). The physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) may or may not be reactive with the organopolysiloxane polymer having a viscosity of ≤ 15,000 mPa.s at 25oC (v)(ii), equally it may or may not be reactive with components of the condensation curable silicone elastomer composition in which it is to be situated. Examples of (v)(ii) include vinyl dimethyl terminated divinyl-functional polydimethylsiloxanes, or siloxane cross-linkers as defined as component (ii) herein such as a polymethylhydrogen dimethylsiloxane copolymers hydroxyl terminated polydiorganosiloxanes, alkoxy terminated polydiorganosiloxanes or silicone plasticizers such as trimethyl terminated polydimethylsiloxanes. Organopolysiloxane polymer swelling agent (v)(ii) is present in the composition in an amount of from about 1.0 to 5.0wt. % of the composition. When the organopolysiloxane polymer swelling agent (v)(ii) is initially stored in one part of a two-part composition, e.g., in a Part B composition it may be present in an amount of from 2.wt. % to 10 wt. % of the part B composition prior to mixing in a 1 : 1 weight ratio with Part A. Similarly, if component (v)(i) is pre-swollen in (v)(ii) an equivalent amount of component (v)(ii) may be utilised as when provided in the Part B composition. Typically, particulates (v)(i) will remain swollen by the presence of organopolysiloxane polymer swelling agent (v)(ii) throughout the lifetime of its use, even after cure. It was found that the inclusion of a pre-cured phase of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) within a second curable network with an organopolysiloxane polymer having a viscosity of ≤ 15,000 mPa.s at 25oC (v)(ii) capable of penetrating and swelling particulates (v)(i) provides a means of forming double networks or inter- penetrating networks (IPNs). Without being bound to current theories it is believed that particulates component (v)(i) consists of a pre-cured cross-linked “mesh” component and which component (v)(ii) is able to penetrate and swell, and that component (v)(ii) also forms a cross-linked network within component (v)(i), the two networks physically entangle so that there is physical engagement rather than mere encapsulation. It was found that the lower the viscosity value of component (v)(ii) the greater the penetration and swelling of component (v)(i) occurred. Furthermore, penetration and swelling did not occur or occurred minimally when the component (v)(ii) had a viscosity of greater 15,000 mPa.s at 25oC. Components (v)(i) and (v)(ii) were compatible, so there appeared to be no problems with component (v)(ii) penetrating into and swelling component (v)(i) providing the viscosity of component (v)(ii) was within the range stated. However, given physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are thermoset materials and due to their crosslinked nature, they were unable to dissolve in component (v)(ii). So, instead the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) swell to accommodate component (v)(ii). The physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are thus physically well bound in the matrix and cannot serve as defects in the matrix, creating voids, surface protrusions or other heterogeneities which is often a problem when merely encapsulated and used as a filler. In one embodiment the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are penetrated and swollen by organopolysiloxane polymer swelling agent (v)(ii) which may or may not be reactive with the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) and / or the condensation curable silicone elastomer composition, for example when stored in two parts, Part A and Part B component (v)(ii) can be a component of the Part A or Part B compositions, typically Part A and the particulates (v)(i) can be swelled after being added to the relevant part of the composition. Alternatively, the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are pre-swollen in component (v)(ii) prior to introduction into the composition. For example, the swelling agent may be introduced into the Part A composition (described in more detail later) and the physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) are swollen for a predetermined period of time in the Part A composition, after which the Parts A and B compositions are mixed together and the composition is cured. It is possible in such cases and providing the polymer viscosity of component (a) is less than 15,000mPa.s that component (a) can also function as the swelling agent, thereby avoiding the need for a separate swelling agent. In one embodiment organopolysiloxane polymer swelling agent (v)(ii) may comprise or consist of component (c) or at least 1.0 wt. % of component (a) or a mixture of both component (c) and said at least 1.0 wt. % of component (a) or an organopolysiloxane polymer plasticizer. Component (v)(ii) is present in an amount of at least 1 wt. % of the composition. Component (v)(i) is either penetrated or swollen with component (v)(ii) prior to introduction. Swelled component (v) Typically said component (v), after component (v)(i) has been swelled by component (v)(ii) for a predetermined time, is present in an amount of from 5 wt. % to 80 wt. % of the composition, alternatively is present in an amount of from 5 wt. % to 50 wt. % of the composition, n, alternatively in an amount of from 7.5 wt. % to 35 wt. % of the composition, alternatively in an amount of from 7.5 wt. % to 30 wt. % of the composition, alternatively in an amount of from 9.0 wt. % to 25 wt. % of the composition. In addition to components (v)(i) and (v)(ii) the condensation curable silicone elastomer composition comprises the following components: Organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, of which at least 25 wt. % of polymer (i) having at least two hydroxyl or hydrolysable groups per molecule. The organopolysiloxane polymer (i) having an average of at least one hydroxyl or hydrolysable group per molecule, of which at least 25 wt. % of polymer (i) having at least two hydroxyl or hydrolysable groups per molecule may have the structure X3-nRnSi-(Z)d –(O)q- (R1ySiO(4-y) / 2)z –(SiR12- Z)d-Si-RnX3-n (1) in which each X is independently a hydroxyl group, a hydrolysable group or an alkyl group, each R is an alkyl, alkenyl or aryl group, each R1is an X group, alkenyl group or aryl group and Z is a divalent organic group; d is 0 or 1, q is 0 or 1 and d+ q = 1; n is 0, 1, 2 or 3, y is 0, 1 or 2, and z is an integer such that said organopolysiloxane polymer (i) has a viscosity of from 750 to 150,000mPa.s at 25oC, alternatively from 750 to 125,000 mPa.s at 25oC. In one embodiment the at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule organopolysiloxane polymer (i) is of the formula X3-nRnSi-(Z)d–(O)q- (R1ySiO(4-y) / 2)z–(SiR12-Z)d-Si-RnX3-n(1a) in which each X is independently a hydroxyl group or a hydrolysable group, each R is an alkyl, alkenyl or aryl group, each R1is an X group, alkyl group, alkenyl group or aryl group and Z is a divalent organic group; d is 0 or 1, q is 0 or 1 and d+ q = 1; n is 0, 1, 2 or 3, y is 0, 1 or 2, and z is an integer. Each X group of organopolysiloxane polymer (i) may be the same or different and can be a hydroxyl group or a condensable or hydrolyzable group or an alkyl group providing at least 25 wt. % of polymer (i) has at least two hydroxyl or hydrolysable groups per molecule. The term "hydrolyzable group" means any group attached to the silicon which is hydrolysed by water at room temperature. The hydrolyzable group X includes groups of the formula -OT, where T is an alkyl group such as methyl, ethyl, isopropyl, octadecyl, an alkenyl group such as allyl, hexenyl, cyclic groups such as cyclohexyl, phenyl, benzyl, beta-phenylethyl; hydrocarbon ether groups, such as 2-methoxyethyl, 2- ethoxyisopropyl, 2-butoxyisobutyl, p-methoxyphenyl or -(CH2CH2O)2CH3. The most preferred hydroxyl group or a condensable or hydrolyzable X groups are hydroxyl groups or alkoxy groups. Illustrative alkoxy groups are methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentoxy, hexoxy octadecyloxy and 2-ethylhexoxy; dialkoxy radicals, such as methoxymethoxy or ethoxymethoxy and alkoxyaryloxy, such as ethoxyphenoxy. The most preferred alkoxy groups are methoxy or ethoxy. When d=1, n is typically 0 or 1 and each X is an alkoxy group, alternatively an alkoxy group having from 1 to 3 carbons, alternatively a methoxy or ethoxy group. In such a case organopolysiloxane polymer (i) has the following structure: X3-nRnSi-(Z)- (R1ySiO(4-y) / 2)z–(SiR12-Z)-Si-RnX3-nWith R, R1, y and z being as described above, n being 0 or 1 and each X being an alkoxy group. Each R is individually selected from alkyl groups, alternatively alkyl groups having from 1 to 10 carbon atoms, alternatively from 1 to 6 carbon atoms, alternatively 1 to 4 carbon atoms, alternatively methyl or ethyl groups; alkenyl groups alternatively alkenyl groups having from 2 to 10 carbon atoms, alternatively from 2 to 6 carbon atoms such as vinyl, allyl and hexenyl groups; and aromatic groups, alternatively aromatic groups having from 6 to 20 carbon atoms or substituted aliphatic organic groups such as 3,3,3-trifluoropropyl groups aminoalkyl groups, polyaminoalkyl groups, and / or epoxyalkyl groups. When X is an alkyl group, the alkyl group has from 1 to 10 carbon atoms, alternatively from 1 to 6 carbon atoms, alternatively 1 to 4 carbon atoms, alternatively methyl or ethyl groups. Each R1is individually selected from the group consisting of X or R with the proviso that an average of at least one hydroxyl or hydrolysable group is present per molecule, and that at least 25 wt. % of polymer (i) molecules have at least two hydroxyl or hydrolysable groups per molecule. It is possible that some R1groups may be siloxane branches off the polymer backbone which branches may have terminal groups as hereinbefore described. Most preferred R1is methyl. Each Z is independently selected from an alkylene group having from 1 to 10 carbon atoms. In one alternative each Z is independently selected from an alkylene group having from 2 to 6 carbon atoms; in a further alternative each Z is independently selected from an alkylene group having from 2 to 4 carbon atoms. Each alkylene groups may for example be individually selected from an ethylene, propylene, butylene, pentylene and / or hexylene group. Additionally, n is 0, 1, 2 or 3, d is 0 or 1, q is 0 or 1 and d+ q = 1. In one alternatively when q is 1, n is 1 or 2 and each X is an OH group or an alkoxy group. In another alternative when d is 1 n is 0 or 1 and each X is an alkoxy group. Organopolysiloxane polymer (i) has a viscosity of from 750 to 150,000mPa.s at 25oC, alternatively from 750 to 125,000 mPa.s at 25oC mPa.s at 25oC, alternatively from 1,000 to 100,000mPa.s at 25oC, alternatively from 1,000 to 75,000mPa.s at 25oC alternatively from 1,000 to 60,000mPa.s at 25oC. Whilst y is 0, 1 or 2, substantially y= 2, e.g., at least 90% alternatively 95% of R1ySiO(4-y) / 2groups are characterized with y = 2. All viscosity measurements given may be measured using a Modular Compact Rheometer (MCR) 302 Anton Paar GmbH of Graz, Austria using the most suitable settings and plates for the viscosity concerned, for example using a 25mm diameter cone and plate fixture with the cone having a 1.988° cone angle, and 104 micrometer truncation at a shear rate of 1s-1. Organopolysiloxane polymer (i) can be a single siloxane represented by Formula (1) or it can be mixtures of organopolysiloxane polymers represented by the aforesaid formula. Hence, the term "siloxane polymer mixture" in respect to component (i) is meant to include any individual organopolysiloxane polymer (i) or mixtures of organopolysiloxane polymer (i). The Degree of Polymerization (DP), (i.e., in the above formula substantially z), is usually defined as the number of monomeric units in a macromolecule or polymer or oligomer molecule of silicone. Synthetic polymers invariably consist of a mixture of macromolecular species with different degrees of polymerization and therefore of different molecular weights. There are different types of average polymer molecular weight, which can be measured in different experiments. The two most important are the number average molecular weight (Mn) and the weight average molecular weight (Mw). The Mn and Mw of a silicone polymer can be determined by gel permeation chromatography (GPC) with precision of about 10-15%. This technique is standard and yields Mw, Mn and the polydispersity index (PI). The degree of polymerisation (DP) =Mn / Mu where Mn is the number- average molecular weight coming from the GPC measurement and Mu is the molecular weight of a monomer unit. PI=Mw / Mn. The DP is linked to the viscosity of the polymer via Mw, the higher the DP, the higher the viscosity. Organopolysiloxane polymer (i) is going to be present in an amount of from 10 to 60 wt. %, alternatively 10 to 55 wt. %, alternatively 20 to 55 wt. % of the composition. Cross-linker (ii) Cross-linker (ii) may be any suitable cross-linker. The cross-linker (ii) may be one or more silanes or siloxanes which contain silicon bonded hydrolysable groups such as acyloxy groups (for example, acetoxy, octanoyloxy, and benzoyloxy groups); ketoximino groups (for example dimethyl ketoximo, and isobutylketoximino); alkoxy groups (for example methoxy, ethoxy, iso-butoxy and propoxy) and alkenyloxy groups (for example isopropenyloxy and 1-ethyl-2-methylvinyloxy). In the case of siloxane based cross-linkers the molecular structure can be straight chained, branched, or cyclic. Cross-linker (ii) preferably has at least three or four hydroxyl and / or hydrolysable groups per molecule which are reactive with the hydroxyl and / or hydrolysable groups in organopolysiloxane polymer (i). When the cross-linker is a silane and when the silane has a total of three silicon-bonded hydroxyl and / or hydrolysable groups per molecule, the fourth group is suitably a non-hydrolysable silicon-bonded organic group. These silicon-bonded organic groups are suitably hydrocarbyl groups which are optionally substituted by halogen such as fluorine and chlorine. Examples of such fourth groups include alkyl groups (for example methyl, ethyl, propyl, and butyl); cycloalkyl groups (for example cyclopentyl and cyclohexyl); alkenyl groups (for example vinyl and allyl); aryl groups (for example phenyl, and tolyl); aralkyl groups (for example 2-phenylethyl) and groups obtained by replacing all or part of the hydrogen in the preceding organic groups with halogen. Preferably however, the fourth silicon-bonded organic groups are methyl. Silanes and siloxanes which can be used as cross-linkers (ii) include alkyltrialkoxysilanes such as methyltrimethoxysilane (MTM) and methyltriethoxysilane, alkenyltrialkoxy silanes such as vinyltrimethoxysilane and vinyltriethoxysilane, isobutyltrimethoxysilane (iBTM). Other suitable silanes include ethyltrimethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, alkoxytrioximosilane, alkenyltrioximosilane, 3,3,3-trifluoropropyltrimethoxysilane, methyltriacetoxysilane, vinyltriacetoxysilane, ethyl triacetoxysilane, di-butoxy diacetoxysilane, phenyl-tripropionoxysilane, methyltris(methylethylketoximo)silane, vinyl-tris- methylethylketoximo)silane, methyltris(methylethylketoximino)silane, methyltris(isopropenoxy)silane, vinyltris(isopropenoxy)silane, ethylpolysilicate, n- propylorthosilicate, ethylorthosilicate, dimethyltetraacetoxydisiloxane. The cross-linker used may also comprise any combination of two or more of the above. Alternatively, cross-linker (ii) may comprise a silyl functional molecule containing two or more silyl groups, each silyl group containing at least one –OH or hydrolysable group, the total of number of – OH groups and / or hydrolysable groups per cross-linker molecule being at least 3. Hence, a disilyl functional molecule comprises two silicon atoms each having at least one hydrolysable group, where the silicon atoms are separated by an organic or siloxane spacer. Typically, the silyl groups on the disilyl functional molecule may be terminal groups. The spacer may be a polymeric chain having a siloxane or organic polymeric backbone. In the case of such siloxane or organic based cross-linkers the molecular structure can be linear, branched, cyclic or macromolecular. In the case of siloxane- based polymers the viscosity of the cross-linker will be within the range of from 0.5 mPa.s to 75,000 mPa.s at 25°C, alternatively from 0.5 mPa.s to 40,000mPa.s at 25oC. For example, cross-linker (ii) may be a disilyl functional polymer, that is, a polymer containing two silyl groups, each having at least one hydrolysable group such as described by the formula RnSi(X)3-n–R3- Si(X)3-nRn where each R, X and n may be individually selected as hereinbefore described above. R3is an alkylene (divalent hydrocarbon radical), alternatively an alkylene group having from 1 to 10 carbon atoms, or further alternatively 1 to 6 carbon atoms or a combination of said divalent hydrocarbon radicals and divalent siloxane radicals. Preferred di-silyl functional polymer cross-linkers have n= 0 or 1, X=OMe and R3being an alkylene group with 4 to 6 carbons. Examples of disilyl polymeric cross-linkers with a silicone or organic polymer chain bearing alkoxy functional end groups include polydimethylsiloxanes having at least one trialkoxy terminal where the alkoxy group may be a methoxy or ethoxy group. Examples might include or 1, 6- bis(trimethoxy silyl)hexane, hexamethoxydisiloxane, hexaethoxydisiloxane, hexa-n- propoxydisiloxane, hexa-n-butoxydisiloxane, octaethoxytrisiloxane, octa-n-butoxytrisiloxane and decaethoxy tetrasiloxane. The amount of cross-linker (ii) present in the composition will depend upon the nature of the cross- linker and in particular, the molecular weight of the molecule selected. The compositions suitably contain cross-linker in at least a stoichiometric amount as compared to organopolysiloxane polymer (i) described above. One or more reinforcing fillers and / or non-reinforcing fillers (iii) The one or more reinforcing fillers identified as component (iii) herein may for example be selected from precipitated silica, fumed silica, precipitated calcium carbonate, or a mixture of two or more thereof. A reinforcing filler is provided to reinforce the physical properties of the elastomers provided when the composition is cured. Typically, the surface area of the reinforcing filler (iii) is at least 15 m² / g in the case of precipitated calcium carbonate measured in accordance with the BET method (ISO 9277: 2010), alternatively 15 to 50 m² / g, alternatively 15 to 25 m² / g. Silica reinforcing fillers have a typical surface area of at least 50 m² / g in accordance with the BET method (ISO 9277: 2010). In the case of high surface area fumed silica and / or high surface area precipitated silica, these may have surface areas of from 75 to 400 m² / g measured in accordance with the BET method (ISO 9277: 2010), alternatively of from 100 to 300 m² / g in accordance with the BET method (ISO 9277: 2010). The reinforcing fillers (iii) may be hydrophobically treated for example with one or more aliphatic acids, e.g., a fatty acid such as stearic acid or a fatty acid ester such as a stearate, or with organosilanes, organosiloxanes, or organosilazanes hexaalkyl disilazane or short chain siloxane diols to render the filler(s) hydrophobic and therefore easier to handle and obtain a homogeneous mixture with the other adhesive components. Specific examples organosilanes, organosiloxanes, or organosilazanes may include, but are not restricted to, silanol terminated trifluoropropylmethylsiloxane, silanol terminated vinyl methyl (ViMe) siloxane, silanol terminated methyl phenyl (MePh) siloxane, liquid hydroxyldimethyl-terminated polydiorganosiloxane containing an average from 2 to 20 repeating units of diorganosiloxane in each molecule, hydroxyldimethyl terminated phenylmethyl Siloxane, hexaorganodisiloxanes, such as hexamethyldisiloxane, divinyltetramethyldisiloxane; hexaorganodisilazanes, such as hexamethyldisilazane (HMDZ), divinyltetramethyldisilazane and tetramethyldi(trifluoropropyl)disilazane; hydroxyldimethyl terminated polydimethylmethylvinyl siloxane, octamethyl cyclotetrasiloxane, and silanes including but not limited to methyltrimethoxysilane, dimethyldimethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, vinyltriethoxysilane, chlorotrimethyl silane, dichlorodimethyl silane, trichloromethyl silane. The surface treatment of the fillers makes them easily wetted by component (I). These surface modified fillers are preferably in a finely divided form and do not clump and can be homogeneously incorporated into the silicone polymer (I). This results in improved room temperature mechanical properties of the uncured compositions. The fillers may be pre-treated or may be treated in situ when being mixed with component (I). A small amount of water can be added together with the silica treating agent(s) as processing aid. Depending on the filler(s) chosen the reinforcing fillers (iii) may be present in an amount of from 2.5 to 60 wt. % of the composition. In the case when the selected fillers are precipitated silica and / or fumed silica or a combination thereof the inorganic fillers (iii) are present in a range of from about 5.0 to 35 wt. % of the composition, alternatively of from 5 to 30 wt. % of the composition, alternatively of from 5 to 25 wt. % of the composition. However, when reinforcing filler (iii) is precipitated calcium carbonate, the composition will tend to include a larger wt. % of the composition, e.g., from 25 to 60 wt. % of the composition, alternatively of from 30 to 60 wt. % of the composition, alternatively of from 35 to 55 wt. % of the composition. When component (iii) is a mixture of silica and precipitated calcium carbonate the wt. % will typically somewhere therebetween. Non-reinforcing fillers, Non-reinforcing fillers, which might be used alone or in addition to the above include aluminite, calcium sulphate (anhydrite), gypsum, nepheline, syenite, quartz, calcium sulphate, magnesium carbonate, ground calcium carbonate, clays such as kaolin, aluminium trihydroxide, magnesium hydroxide (brucite), graphite, copper carbonate, e.g., malachite, nickel carbonate, e.g., zarachite, barium carbonate, e.g., witherite and / or strontium carbonate e.g., strontianite. Silicates from the group consisting of olivine group; garnet group; aluminosilicates; ring silicates; chain silicates; and sheet silicates. The olivine group comprises silicate minerals, such as but not limited to, forsterite and Mg2SiO4. The garnet group comprises ground silicate minerals, such as but not limited to, pyrope; Mg3Al2Si3O12; grossular; and Ca2Al2Si3O12. Aluminosilicates comprise ground silicate minerals, such as but not limited to, sillimanite; Al2SiO5; mullite; 3Al2O3.2SiO2; kyanite; and Al2SiO5. The ring silicates group comprises silicate minerals, such as but not limited to, cordierite and Al3(Mg,Fe)2[Si4AlO18]. The chain silicates group comprises ground silicate minerals, such as but not limited to, wollastonite and Ca[SiO3]. The sheet silicates group comprises silicate minerals, such as but not limited to, mica; K2AI14[Si6Al2O20](OH)4; pyrophyllite; Al4[Si8O20](OH)4; talc; Mg6[Si8O20](OH)4; serpentine for example, asbestos; Kaolinite; Al4[Si4O10](OH)8; and vermiculite. The non-reinforcing fillers may also be hydrophobically treated as described above. Condensation Catalyst (iv) Some of the compositions disclosed herein do not require a catalyst to aid in curing the composition although suitable catalysts may be used if appropriate. Hence, the composition may comprise a condensation catalyst (iv). This increases the speed at which the composition cures. The catalyst (iv) chosen for inclusion in a particular silicone sealant composition depends upon the speed of cure required. Catalyst (iv) may be a tin-based catalyst. Tin based catalysts are typically used in compositions which are stored in two parts and mixed together immediately prior to use as discussed further below. Suitable tin based condensation catalysts (iv) include tin triflates, dialkyltin compounds, selected from dimethyltin di-2-ethylhexanoate, dimethyltin dilaurate, di-n-butyltin diacetate (DBTDA), di-n-butyltin di-2-ethylhexanoate, dimethyltin dineodecanoate (DMTDN), dioctyltin dineodecanoate (DOTDN), di-n-butyltin dicaprylate, di-n-butyltin di-2,2-dimethyl octanoate, di-n- butyltin octanoate, di-n- butyltin dilaurate (DBTDL), di-n-butyltin distearate, di-n-butyltin dimaleate, di-n-butyltin dioleate, di-n-octyltin di-2-ethylhexanoate, di-n-octyltin di-2,2-dimethyl octanoate, di-n-octyltin dimaleate, Di-n-octyl tin dilaurate (DOTDL), di-n-butyl tin oxide, tin butyrate, butyltintri-2-ethylhexoate, tin naphthenate, tin octoate, triethyltin tartrate and di-n-octyl tin oxide. The tin catalyst may be present in an amount of from 0.01 to 3 wt. % of the composition; alternatively, 0.1 to 0.75 wt. % of the composition. Titanate and / or zirconate-based catalysts (iv) e.g. alkyl titanate and alkyl zirconate catalysts are more often utilised in one-part sealant compositions, i.e., compositions not requiring mixing prior to use. Suitable titanate and / or zirconate-based catalysts (iv) may comprise a compound according to the general formula M[OR22]4where M is titanium or zirconium and each R22may be the same or different and represents a monovalent, primary, secondary or tertiary aliphatic hydrocarbon group which may be linear or branched containing from 1 to 10 carbon atoms. Optionally the titanate or zirconate may contain partially unsaturated groups. However, preferred examples of R22include but are not restricted to methyl, ethyl, propyl, isopropyl, butyl, tertiary butyl and a branched secondary alkyl group such as 2, 4-dimethyl-3-pentyl. Preferably, when each R22is the same, R22is an isopropyl, branched secondary alkyl group or a tertiary alkyl group, in particular, tertiary butyl. Suitable examples include for the sake of example, tetra n-butyl titanate, tetra t-butyl titanate, tetra t- butoxy titanate, tetraisopropoxy titanate and diisopropoxydiethylacetoacetate titanate. Alternatively, the titanate or zirconate may be chelated. The chelation may be with any suitable chelating agent such as an alkyl acetylacetonate such as methyl or ethylacetylacetonate. Alternatively, the titanate may be monoalkoxy titanates bearing three chelating agents such as for example 2-propanolato, tris isooctadecanoato titanate. The titanium or zirconium catalyst may be present in an amount of from 0.01 to 3 wt. % of the composition; alternatively, 0.1 to 0.75 wt. % of the composition. Optional Additives A variety of optional additives may also be incorporated into the compositions herein, often dependent on the end use of the composition being prepared. These may include, for the sake of example, plasticizers and extenders, rheology modifiers, adhesion promoters, chain extenders, coloring agents and biocides. The composition as hereinbefore described may be utilised for e.g., sealants, coatings and / or adhesives and the different uses may necessitate the inclusion of one or more other optional additives for optimum utility. These may include one or more of the following, dependent on end use: Plasticizers and Extenders The composition as hereinbefore described may comprise a plasticizer or extender (sometimes referred to as a processing aid) in the form of a silicone or organic fluid which is unreactive with organopolysiloxane polymer(s) (i) and / or crosslinker(s) (ii), whether reactive or unreactive. If present the plasticizer or extender content will be present in an amount of from 5 to 30 wt. % of the composition, alternatively from 5 to 10 wt. % or the composition. These may function as component (v)(ii) if an unreactive component (v)(ii) is desired and their viscosity is suited for the purpose. Examples of non-reactive silicone fluids useful as plasticizers include polydiorganosiloxanes such as polydimethylsiloxane having terminal triorganosiloxy groups wherein the organic substituents are, for example, methyl, vinyl or phenyl or combinations of these groups. Such polydimethylsiloxanes can for example have a viscosity of from about 5 to about 100,000 mPa.s at 25oC. When present, these can be in Part A or in Part B of the two-part composition with a cross-linker and catalyst. Alternatively compatible organic plasticizers may be utilised additionally to or instead of the silicone fluid plasticizer include dialkyl phthalates wherein the alkyl group may be linear and / or branched and contains from six to 20 carbon atoms such as dioctyl, dihexyl, dinonyl, didecyl, diallanyl and other phthalates, and analogous adipate, azelate, oleate and sebacate esters; polyols such as ethylene glycol and its derivatives; and organic phosphates such as tricresyl phosphate and / or triphenyl phosphates. Examples of extenders for use in compositions herein include mineral oil based (typically petroleum based) paraffinic hydrocarbons, mixtures of paraffinic and naphthenic hydrocarbons, paraffin oils comprising cyclic paraffins and non-cyclic paraffins and hydrocarbon fluids containing naphthenics, polycyclic naphthenics and paraffins, or polyalkylbenzenes such as heavy alkylates (alkylated aromatic materials remaining after distillation of oil in a refinery). Examples of such extenders are discussed in GB2424898 the content of which is hereby enclosed by reference. If the viscosity of the plasticizer is 15,000mPa.s at 25oC it may additionally function as a non-reactive swelling agent (v) (ii) Other ingredients which may be included in the two-part composition include but are not restricted to rheology modifiers; adhesion promoters, pigments, heat stabilizers, flame retardants, UV stabilizers, chain extenders, cure modifiers, electrically and / or heat conductive fillers, and fungicides and / or biocides and the like. Rheology Modifiers Rheology modifiers which may be incorporated in moisture curable compositions according to the invention include silicone organic co-polymers such as those described in EP 0802233 based on polyols of polyethers or polyesters; non-ionic surfactants selected from the group consisting of polyethylene glycol, polypropylene glycol, ethoxylated castor oil, oleic acid ethoxylate, alkylphenol ethoxylates, copolymers or ethylene oxide and propylene oxide, and silicone polyether copolymers; as well as silicone glycols. For some systems these rheology modifiers, particularly copolymers of ethylene oxide and propylene oxide, and silicone polyether copolymers, may enhance the adhesion of the sealant to substrates, particularly plastic substrates. Adhesion Promoters Examples of adhesion promoters which may be incorporated in moisture curable compositions according to the invention include alkoxysilanes such as aminoalkylalkoxysilanes, for example 3- aminopropyltriethoxysilane, epoxyalkylalkoxysilanes, for example, 3- glycidoxypropyltrimethoxysilane and, mercapto-alkylalkoxysilanes, and reaction products of ethylenediamine with silylacrylates. Isocyanurates containing silicon groups such as 1, 3, 5- tris(trialkoxysilylalkyl) isocyanurate may additionally be used. Further suitable adhesion promoters are reaction products of epoxyalkylalkoxysilanes such as 3-glycidoxypropyltrimethoxysilane with amino-substituted alkoxysilanes such as 3-aminopropyltrimethoxysilane and optionally with alkylalkoxysilanes such as methyltrimethoxysilane. Chain extenders Chain extenders may include difunctional silanes which extend the length of the polysiloxane polymer chains before cross linking occurs and, thereby, reduce the modulus of elongation of the cured elastomer. Chain extenders and crosslinkers compete in their reactions with the functional polymer ends; in order to achieve noticeable chain extension, the difunctional silane must have substantially higher reactivity than the trifunctional crosslinker with which it is used. Suitable chain extenders include diamidosilanes such as dialkyldiacetamidosilanes or alkenylalkyldiacetamidosilanes, particularly methylvinyldi(N-methylacetamido)silane, or dimethyldi(N-methylacetamido)silane, diacetoxysilanes such as dialkyldiacetoxysilanes or alkylalkenyldiacetoxysilanes, diaminosilanes such as dialkyldiaminosilanes or alkylalkenyldiaminosilanes, dialkoxysilanes such as dimethoxydimethylsilane, diethoxydimethylsilane and α-aminoalkyldialkoxyalkylsilanes, polydialkylsiloxanes having a degree of polymerization of from 2 to 25 and having at least two acetamido or acetoxy or amino or alkoxy or amido or ketoximo substituents per molecule, and diketoximinosilanes such as dialkylkdiketoximinosilanes and alkylalkenyldiketoximinosilanes. Coloring agents (Pigments and other colorants) Examples of colouring agents for which may be utilized in the present composition include pigments, vat dyes, reactive dyes, acid dyes, chrome dyes, disperse dyes, cationic dyes and mixtures thereof. as described herein may further comprise one or more pigments and / or colorants which may be added if desired. The pigments and / or colorants may be coloured, white, black, metal effect, and luminescent e.g., fluorescent and phosphorescent. Pigments are utilized to colour the composition as required. Any suitable pigment may be utilized providing it is compatible with the composition herein. Suitable white pigments and / or colorants include titanium dioxide, zinc oxide, lead oxide, zinc sulfide, lithophone, zirconium oxide, and antimony oxide. Suitable non-white inorganic pigments and / or colorants include, but are not limited to, iron oxide pigments such as goethite, lepidocrocite, hematite, maghemite, and magnetite black iron oxide, yellow iron oxide, brown iron oxide, and red iron oxide; blue iron pigments; chromium oxide pigments; cadmium pigments such as cadmium yellow, cadmium red, and cadmium cinnabar; bismuth pigments such as bismuth vanadate and bismuth vanadate molybdate; mixed metal oxide pigments such as cobalt titanate green; chromate and molybdate pigments such as chromium yellow, molybdate red, and molybdate orange; ultramarine pigments; cobalt oxide pigments; nickel antimony titanates; lead chrome; carbon black; lampblack, and metal effect pigments such as aluminium, copper, copper oxide, bronze, stainless steel, nickel, zinc, and brass. Suitable organic non-white pigments and / or colorants include phthalocyanine pigments, e.g., phthalocyanine blue and phthalocyanine green; monoarylide yellow, diarylide yellow, benzimidazolone yellow, heterocyclic yellow, DAN orange, quinacridone pigments, e.g., quinacridone magenta and quinacridone violet; organic reds, including metallized azo reds and nonmetallized azo reds and other azo pigments, monoazo pigments, diazo pigments, azo pigment lakes, β-naphthol pigments, naphthol AS pigments, benzimidazolone pigments, diazo condensation pigment, isoindolinone, and isoindoline pigments, polycyclic pigments, perylene and perinone pigments, thioindigo pigments, anthrapyrimidone pigments, flavanthrone pigments, anthanthrone pigments, dioxazine pigments, triarylcarbonium pigments, quinophthalone pigments, and diketopyrrolo pyrrole pigments. Typically, the pigments and / or colorants, when particulates, have average particle diameters in the range of from 10 nm to 50 µm, preferably in the range of from 40 nm to 2 µm. The pigments and dyes may be used in form of pigment masterbatch composed of them dispersed in component (a) at the ratio of 25:75 to 70:30. Biocides Biocides may additionally be utilized in the composition if required. It is intended that the term "biocides" includes bactericides, fungicides and algicides, and the like. Suitable examples of useful biocides which may be utilised in compositions as described herein include, for the sake of example: Carbamates such as methyl-N-benzimidazol-2-ylcarbamate (carbendazim) and other suitable carbamates, 10,10'-oxybisphenoxarsine, 2-(4-thiazolyl)-benzimidazole, N-(fluorodichloromethylthio)phthalimide, diiodomethyl p-tolyl sulfone, if appropriate in combination with a UV stabilizer, such as 2,6-di(tert-butyl)-p-cresol, 3-iodo-2-propinyl butylcarbamate (IPBC), zinc 2-pyridinethiol 1-oxide, triazolyl compounds and isothiazolinones, such as 4,5-dichloro-2-(n-octyl)-4-isothiazolin-3-one (DCOIT), 2-(n-octyl)-4-isothiazolin-3-one (OIT) and n-butyl-1,2-benzisothiazolin-3-one (BBIT). Other biocides might include for example Zinc Pyridinethione, 1-(4-Chlorophenyl)-4,4-dimethyl-3-(1,2,4-triazol-1-ylmethyl)pentan-3-ol and / or 1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl] methyl]-1H-1,2,4-triazole. The fungicide and / or biocide may suitably be present in an amount of from greater than 0 to 0.3 wt. % of the composition and may be present in an encapsulated form where required such as described in EP2106418. Hence the condensation curable silicone elastomer composition capable of cure to an elastomeric material, comprises any suitable combination of the following (i) an organopolysiloxane polymer as previously described in an amount of from 10 to 60 wt. % of the composition, alternatively 10 to 55 wt. %, alternatively 20 to 55 wt. %, of the composition. (ii) any siloxane and / or silane cross-linker as previously described and is present in an amount present dependent upon the nature of the cross-linker and in particular, the molecular weight of the molecule selected in at least a stoichiometric amount as compared to organopolysiloxane polymer (i) described above. (iii) any suitable reinforcing filler(s) as described above preferably in a finely divided form and hydrophobically treated for example with one or more aliphatic acids, e.g., a fatty acid such as stearic acid or a fatty acid in an amount of from about 5.0 to 35 wt. % of the composition, alternatively of from 5 to 30 wt. % of the composition, alternatively of from 5 to 25 wt. % of the composition. However, when reinforcing filler (iii) is precipitated calcium carbonate, the composition will tend to include a larger wt. % of the composition, e.g., from 25 to 60 wt. % of the composition, alternatively of from 30 to 60 wt. % of the composition, alternatively of from 35 to 55 wt. % of the composition. When component (iii) is a mixture of silica and precipitated calcium carbonate the wt. % will typically somewhere therebetween. Component (iii) may alternatively or additionally include non-reinforcing fillers. (iv) any suitable condensation cure catalyst as described above, such as tin based catalysts previously listed which are most often but not always used in two-part compositions present in an amount of from 0.01 to 3 wt. %of the composition; alternatively, 0.1 to 0.75 wt. %of the composition. Alternatively, the catalyst may be titanate and / or zirconate-based catalysts e.g., alkyl titanates and / or alkyl zirconates as previously described (iv) which are more often utilised in one- part sealant compositions, i.e., compositions not requiring mixing prior to use. Such titanium or zirconium based catalysts may be present in an amount of from 0.01 to 3 wt. %of the composition; alternatively, 0.1 to 1.5 wt. % of the composition; and (v) physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) as described above having an average unswollen particle size of less than 1 mm, which physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) have been penetrated and swollen by an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25 C. Typically said component (v), after component (v)(i) has been swelled by component (v)(ii) for a predetermined time as discussed above, is present in the composition in an amount of from 7.5 wt. % to 30 wt. % of the is present in the composition in an amount of from 7.5 wt. % to 30 wt. % of the composition, alternatively in an amount of from 7.5 wt. % to 25 wt. % of the composition, alternatively in an amount of from 9.0 wt. % to 20 wt. % of the composition. The composition can be any suitable combination of the above and where required any one or more of optional additives described above with the total wt. % (weight %) of the composition is 100wt. %. The silicone elastomeric material as hereinbefore described is made from a condensation curable room temperature vulcanisable (RTV) silicone composition comprising physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates and can be utilised in a wide range of applications such as for sealants, coatings and adhesives. The condensation curable room temperature vulcanisable (RTV) silicone compositions described herein may be stored as one-part compositions or in multiple parts (e.g., two or three parts) prior to use, with the parts being mixed together shortly before use in the latter case. Most often one-part compositions are catalyzed with a titanium and / or zirconium-based catalyst. These tend to cure via a skin or diffusion cured process are applied in a layer that is thinner than typically 15 mm. and takes place by the formation of a cured skin at the composition / air interface subsequent to the sealant / encapsulant being applied on to a substrate surface. Thereafter, the cure speed is dependent on the speed of diffusion of moisture from the sealant / encapsulant interface with air to the inside (or core), leading to a gradual thickening of the cured skin over time from the outside / surface to the inside / core. In contrast the two-part compositions cure throughout the bulk of the sealant and therefore tend to be faster curing and curing typically starts once the multiple parts are mixed together. The compositions utilised are designed to have appropriate physical characteristics upon cure for the intended end us. Hence, they may be relatively high viscosity compositions in the case of sealants and much lower viscosity compositions when used for coatings i.e., coatings for roofing surfaces and or other construction substrates may be of a very low viscosity in order for the composition to be applied by brush or spray whereas adhesives and / or sealants may have higher viscosities. However, in each case the physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates are compatible with the compositions used. In the case when the end-product is used as a sealant, the composition herein may be provided in either a non-sag formulation or in a self-levelling formulation. A self-levelling formulation means it is “self-levelling” when extruded from the storage container into a horizontal joint; that is, the sealant will flow under the force of gravity sufficiently to provide intimate contact between the sealant and the sides of the joint space. This allows maximum adhesion of the sealant to the joint surface to take place. The self-levelling also does away with the necessity of tooling the sealant after it is placed into the joint, such as is required with a sealant which is designed for use in both horizontal and vertical joints. A non-sag composition unlike the latter typically will not visibly flow under the force of gravity and typically needs tooling into the position / joint which it is intended to seal. There is provided herein a sealant composition as described above capable of being applied as a paste to a joint between two adjacent substrate surfaces where it can be worked or tooled, prior to curing, to provide a smooth surfaced mass which will remain in its allotted position until it has cured into an elastomeric material adherent to the adjacent substrate surfaces. The incorporation of the physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates reduces the carbon footprint by reusing the particulates to replace new silicone ingredients and the swelling step caused by the mixing of components (v)(i) and (v)(ii) provides a route for reusing the recycled particulates. Such sealants can be utilised in a typical sealing process for filling a space between two substrates, so as to create a seal therebetween, comprising: a) providing a condensation curable silicone elastomer composition as hereinbefore described, and either b) applying the condensation curable silicone elastomer composition to a first substrate, and bringing a second substrate in contact with the silicone composition that has been applied to the first substrate, or c) filling a space formed by the arrangement of a first substrate and a second substrate with the condensation curable silicone elastomer composition and curing the condensation curable silicone elastomer composition. However, alternatively, the use of a relatively low viscosity composition is particularly beneficial for self- levelling sealant compositions because reinforcement is provided without a significant increase in composition viscosity. Such self-levelling sealants may be used as highway sealants in the sealing of asphalt pavement. Asphalt paving material is used to form asphalt highways by building up an appreciable thickness of material (e.g., a thickness of about 20.32 cm), and for rehabilitating deteriorating concrete highways by overlaying with a layer which might as thick as 10.16 cm or even greater if deemed necessary. In both instances the asphalt overlays may undergo a phenomenon known as reflection cracking in which cracks form in the asphalt overlay due to the movement of the underlying concrete at the joints present in the concrete. These reflection cracks need to be sealed to prevent the intrusion of water into the crack, which will cause further destruction of the asphalt pavement when the water freezes and expands and self-levelling silicone sealants are excellent for this purpose. Hence, this provides a composition in which reinforcement is provided whilst viscosity of the composition is not significantly increased thereby enabling self- levelling of the composition to occur upon application onto a substrate. The ability of a sealant as hereinbefore described to flow out upon application into a crack because reinforcement does not significantly increase the composition viscosity prior to curing enables the sealant to self-level, i.e., to have sufficient flow, under the force of gravity, to form an intimate contact with the sides of irregularly cracked walls and form a good bond and avoids the necessity of tooling the sealant after it has been introduced into the crack. Alternatively, when the composition provided herein is being utilised as an elastomeric coating formulation, e.g., as a barrier coating for construction materials or as a weatherproof coating for a roof, the composition may have a viscosity not dissimilar to a paint thereby enabling application by e.g., brush, roller or spray gun or the like. A coating composition as described herein, when applied onto a substrate, may be designed to provide the substrate with e.g., long-term protection from air and water infiltration, under normal movement situations caused by e.g., seasonal thermal expansion and / or contraction, ultra-violet light and the weather. Such a coating composition can maintain water protection properties even when exposed to sunlight, rain snow or temperature extremes. Hence, there is also provided herein a wall and / or roof assembly comprising an elastomeric coating resulting from curing a liquid applied, composition as hereinbefore described. The composition may be applied on to a substrate at any suitable wet thickness, such as for example from 0.50mm to 1.75, alternatively 0.50mm to 1.5mm and may dry subsequent to application to a dry thickness of from 0.25mm to 0.80mm. It may be applied onto any suitable construction substrate, such as a roofing substrate, a construction sheathing substrate, a metal substrate such as a painted or unpainted aluminium substrate, a galvanized metal substrate, a wood framing substrate, concrete masonry, foam plastic insulated sheeting, exterior insulation, pre-formed concrete, cast in place concrete wood framing, oriented strand board (OSB), exterior sheathing, a preformed panel, plywood and wood, a steel stud wall, roofing felting for roofing membranes, and / or anon-permeable wall assembly. In the case of a roofing surface, The roofing surface may be of any suitable construction material for example, slates and tiles and / or reinforced concrete; nailable, lightweight concrete; poured gypsum; formed metal; and wood, (e.g., in the form of planks or plywood sheets) as well as single ply roofing membranes such as ethylene propylene diene monomer rubber (EPDM), thermoplastic olefins (TPO) and modified bitumen (mod-bit) base sheets, cap sheets or flashings. Given silicone materials are significantly more resistant to temperature change than many alternatives used to form elastomeric roofing membranes, or to repair waterproof membranes an elastomeric coating made from the composition as hereinbefore described will remain elastomeric at high and low temperatures and as such is far less likely to split or crack due to building movements and / or temperature variation. Furthermore, even if moisture penetration does occur e.g., due to a faulty moisture barrier layer in the roofing construction (e.g., under a layer of roof insulation), the moisture can escape through the silicone elastomeric coating on the membrane, even though it is impervious to liquid water. Indeed, one added advantage is that a composition as provided herein may also be utilised as the aforementioned moisture barrier, which will of course be an added advantage from a compatibility perspective. In one embodiment there is provided a method of weatherproofing a roofing surface by applying a condensation curable silicone elastomer composition capable of cure to an elastomeric material in the form of an elastomeric coating composition over a roofing surface or substrate using the following sequential steps: (A) laying a piece or pieces of roofing fabric over a roofing construction substrate surface; (B) if required bonding pieces of roofing fabric together at any seams; (C) adhering the roofing fabric to the roofing construction substrate surface at least at all edges and projections; (D) coating the roofing fabric with an elastomeric coating composition as hereinbefore described; and (E) Curing the elastomeric coating composition to form a water impermeable membrane. Typically, the elastomeric coating composition will at least partially penetrate the roofing fabric prior to cure and as such the resulting elastomeric coating will be in and / or on the roofing fabric once cured. The roofing construction substrate may be of any suitable material. For example, it may consist of a structured deck of wood, concrete and or metal on which are one or more layers of vapour barrier(s) and / or insulation. Indeed, the vapour barrier provided may be a layer of the composition as hereinbefore described. A condensation curable silicone elastomer composition capable of cure to an elastomeric material as hereinbefore described may alternatively be utilised as an adhesive. In one example the adhesive might be used for adhering two suitable substrates together, e.g., again using a roofing application purely as an example, for bonding in a roofing application adhering roofing fabric seams together and / or for adhering a roofing fabric to a roofing substrate. The adhesive may be extruded from a storage tube or the like around the edge of the roofing surface, then the roofing fabric may be placed on top of the adhesive and then pressed down over the bead of adhesive. When the adhesive cures, it bonds the roofing fabric to the roofing surface. In some cases, depending upon the nature of the roofing surface and the type of adhesive being used, it may be necessary to first prime the roofing surface before applying the adhesive. Other applications where the condensation curable silicone elastomer composition capable of cure to an elastomeric material as hereinbefore described is used as an adhesive includes but ae not limited use a flashing adhesive. Examples In the following examples, the compositions are defined in weight % (wt. %) unless otherwise stated. Unless otherwise indicated all viscosity measurement given are The viscosity may be measured using any suitable means e.g., a Modular Compact Rheometer (MCR) 302 Anton Paar GmbH of Graz, Austria using a 25mm diameter cone and plate fixture with the cone having a 1.988° cone angle, and 104 micrometer truncation at a shear rate of 1s-1. all viscosity measurements were taken at 25oC unless otherwise indicated. All Shore hardness measurements were measured using either the Shore A method or the Shore 00 method as defined ASTM D2240-15 dependent on the apparent softness, with the Shore 00 method being used for softer elastomers. Swelling Reference Examples In order to show that low viscosity silicone fluids will swell a hydrosilylation cured silicone elastomer, when the elastomer is soaked / immersed into a low viscosity silicone fluid (e.g., less than 15,000mPa.s), the following experiment was undertaken. A slab of a cured liquid silicone rubber material was prepared following the instructions supplied with the product for mixing the two-part compositions provided. Three 1-inch x 1-inch x 0.08in (2.54cm x 2.54 cm x 2mm) rectangular samples were cut from the slabs. The three rectangular samples were immersed in three dimethylvinyl terminated polydimethylsiloxane having different viscosities, the first fluid had an approximate viscosity of 30mPa.s, the second fluid had an approximate viscosity of 430mPa.s and the third fluid had an approximate viscosity of 44,000mPa.s measured as described above at 25oC. Each sample remained immersed in the respective fluid for 24 hours after which they were analysed for changes. It was found that the sample immersed in the fluid having a viscosity of 44,000mPa.s gained no mass and did not change in size. The sample immersed in the 430 mPa.s fluid had an 8% increase in mass and size. The sample immersed in 30 mPa.s fluid had a 30% increase in mass and size. Hence, it can be seen that swelling did take place when the samples were immersed in low viscosity silicone fluids, but no noticeable swelling occurred when immersed in the fluid having a viscosity of 44,000mPa.s. Laboratory Preparation of particulates In one example, cured silicone rubber block samples were shredded with a paper shredder and cut with scissors until they were of a predetermined size of less than 2cm particle size. They were then fed into a MikroTMUMP-B mill commercially available from Hosokawa Micron Corporation. The shredded / cut rubber samples were mixed with dry ice (the dry ice had been previously crushed to a powder using mortar and pestle) in a weight ratio of approximately 1:1 in order to reduce the temperature of the rubber and help stiffen it for milling. The rubber / dry ice mixture was then fed into the mill using a knife blade rotor rotating at an rpm of > 10,000. The rubber was then allowed to leave the milling chamber through a stainless-steel screen when it was cut finer than the hole size of the screen. The screen had 2-3 mm diameter round holes for a first pass. The rubber milled in the first pass was then subjected to a second pass with dry ice again as before and fed through the MikroTMUMP-B mill for a second pass this time using a 1mm slotted screen. Analytical Assessment of Particle Size. The particle size distribution of the milled silicone elastomer particulates was measured using laser diffraction. A Beckman CoulterTMLS 13320 Particle Size Analyzer with the Tornado (dry) module was used. Approximately 25 mL of a milled bulk solids sample was added into a vial, which was placed in the LS 13320 Tornado module which was then activated. When activated, the Tornado module automatically vacuumed the sample past a laser and the diffraction signal of the sample was measured. Beckman CoulterTMsoftware is then used to deconvolute the diffraction signal to a particle size distribution determined using Fraunhofer diffraction model. A two-part condensation curable composition (tin cured) was utilised for Ref.1and for Ex.1 and 2. The composition utilised is depicted in table 1a below. A one--part condensation curable composition (titanate cured) was utilised for Ref.2 and for Ex.3 and 4. The compositions utilised are depicted in tables 1a and 1b respectively below. Table 1a: 2-part ccondensation curable room temperature vulcanisable (RTV) silicone composition Material Part A Part B hydroxy-terminated partially trimethylsilyl terminated PDMS with viscosity 54.9 2 (i) have been introduced into the part A composition. In such a case this polymer is considered a reactive swelling agent. In the event the particulates (v)(i) had been introduced into the part B composition the trimethylsilyl terminated polydimethylsiloxane (PDMS) with viscosity of 12,500 mPa.s at 25 ℃ which functions as a plasticizer would have functioned as a non-reactive (v)(ii). Table 1b: 1-part condensation curable room temperature vulcanisable (RTV) silicone composition Material H d t i t d ti ll t i th l il l t i t d PDM ith i it f 27 00 In the Table 1b composition, once the particulates are introduced into the composition the viscosity of polymer (a) is too high to function as the swelling agent (v)(ii) and as such the plasticizer functions as a non-reactive swelling agent. The Shore A value of the cured elastomer resulting from the cure of both the 2-part and 1-part condensation curable room temperature vulcanisable (RTV) silicone compositions depicted in Tables 1a and 1b above was approximately 40 Shore A measured in accordance with ASTM D2240- 15. Samples of the compositions in combination with two alternative forms of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) were prepared on the basis of the compositions indicated in Table 2. A comparative example was contemplated in which 90 wt. % of the 2-part RTV silicone composition was to be mixed with a 10 wt. % amount of a hydrosilylation curable silicone rubber composition but it was decided that it might prove to be too dangerous because of the potential generation of hydrogen gas and the consequential possibility of an explosion. Table 2: Compositions using two alternative forms of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) were prepared (wt. %) Ingredient type Ref.1 Ex.1 Ex.2 Ref.2 Ex.3 Ex.4 2-part RTV silicone composition (Table 1a) 100 90 90 hydrosilylation cured liquid silicone rubber (LSR) coating composition coating composition containing an HMDZ treated fumed silica having a Shore A hardness of about 10. Because Shore A hardness measurements are less accurate for soft materials registering a value of 10 or less on the Shore A scale, it may be more precise to report using a Shore 00 hardness scale. In this case, the original coating material had an equivalent Shore 00 hardness value of about 80. Physically recycled and / or reclaimed silicone rubber 2 Particulates - were prepared from a hydrosilylation cured liquid silicone rubber (LSR) coating composition coating composition containing an HMDZ treated fumed silica-containing having a Shore A hardness of about 50. In the cases of Ref.1, and Ex.1 and 2 which depict two-part sealant compositions, the Part A composition depicted in Table 1 was prepared. The relevant physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) as indicated in Ex.1 and Ex.2 respectively from Table 2 were introduced into the Part A composition and the particulates were allowed to swell by interaction with the reactive swelling agent (v)(ii) provided in the Part A composition. In this instance component (a) the polymer being utilised in the sealant functioned as the swelling agent (v)(ii). Swelling took place for approximately 24 hours after which the Part A composition containing the swelled particulates was inter-mixed with a previously prepared Part B composition and the resulting condensation curable room temperature vulcanisable (RTV) silicone composition was cured at room temperature for seven days. Subsequent to cure the resulting cured samples were analysed for their physical properties. The mechanical properties of these specimens, namely the modulus at 100% extension (MPa), elongation at break (%) and Tensile strength (MPa) were determined following ASTM D 412 – 06. The results are depicted in Table 3a. Table 3a: Mechanical Properties of 2-part sealant alone and after addition of physically recycled and / or reclaimed hydrosilylation cured silicone rubber particulates. Modulus (MPa) at % value Elongation % value Tensile Strength % value 100% extension of M100 % (E) of E of (TS) (MPa) of TS of I he non-regrind-containing RTV matrix), Ref.1. The high elongations at break and tensile strengths belie the successful curing of these compositions. In the cases of Ref.2, and Ex.3 to 4 which depict a one-part sealant composition, The sealant composition was first prepared. The relevant physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) as indicated in Ex.3 and Ex.4 respectively from Table 2 were introduced into the composition and the particulates were allowed to swell by interaction with the reactive swelling agent (v)(ii). In this instance the trimethylsilyl terminated PDMS with viscosity of 100 mPa.s at 25 ℃ (plasticizer) was used as an unreactive swelling agent. Swelling took place for approximately 24 hours after which the resulting condensation curable room temperature vulcanisable (RTV) silicone composition was cured at room temperature for seven days in rrectangular slabs of dimensions 5 inches by 5 inches by 0.08 inches (12.7cm x 12.7 cm x 0.2mm). Subsequent to cure the resulting cured samples were analysed for their physical properties. The mechanical properties of these specimens, namely the modulus at 100% extension (MPa), elongation at break (%) and Tensile strength (MPa) were determined following ASTM D 412 – 06. The results are depicted in Table 3b. Table 3b: Mechanical Properties of 1-part sealant alone and after addition of physically recycled and / or reclaimed hydrosilylation cured silicone rubber particulates. Modulus (MPa) at % value % value of % value Elongation Tensile Strength of Similar positive results were observed for the 1-part composition examples Ex.3 and Ex.4 compared to Ref.2. The ability to obtain cured materials at all from Ex.1 – Ex.4 in a safe manner is notable and unexpected, much less cured rubbers with such useful tensile properties as shown in Table 3b.

Claims

CLAIMS 1) A condensation curable silicone elastomer composition capable of cure to an elastomeric material, the composition comprising (i) Organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, wherein at least 25 wt. % of said organopolysiloxane polymer (i) have at least two hydroxyl or hydrolysable groups per molecule and a viscosity of from 750 to 150,000mPa.s at 25oC, (ii) a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in organopolysiloxane polymer; (iii) One or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; (iv) a condensation cure catalyst; and (v) physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, which physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) have been penetrated and swollen by an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to 15,000 mPa.s at 25oC.

2. A condensation curable silicone elastomer composition capable of cure to an elastomeric material, in accordance with claim 1 wherein the at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule organopolysiloxane polymer (i) is of the formula X3-nRnSi-(Z)d–(O)q- (R1ySiO(4-y) / 2)z–(SiR12-Z)d-Si-RnX3-n(1a) in which each X is independently a hydroxyl group or a hydrolysable group, each R is an alkyl, alkenyl or aryl group, each R1is an X group, alkyl group, alkenyl group or aryl group and Z is a divalent organic group; d is 0 or 1, q is 0 or 1 and d+ q = 1; n is 0, 1, 2 or 3, y is 0, 1 or 2, and z is an integer.

3. A condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with claim 1 or 2 wherein physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates physically recycled and / or reclaimed(v)(i) are obtained from silicone rubber elastomers prepared from hydrosilylation curable compositions, peroxide free-radical cure compositions or UV curable silicone rubber compositions.

4. A condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with claim 3 wherein physically recycled and / or reclaimed silicone rubber elastomers were obtained from airbag coatings, gaskets and seals adhesives, coatings, foams, molded rubber articles, hoses and tubing, encapsulants and potting agents. .

5. A condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with any preceding claim, wherein the composition is a sealant composition, an elastomeric coating composition or an adhesive composition.

6. A condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with claim 5 and which is capable of being applied as a paste to a joint between two or more than two adjacent substrate surfaces where it can be worked, prior to curing, to provide a smooth surfaced mass which will remain in its allotted position until it has cured into an elastomeric material adherent to the adjacent substrate surfaces.

7. A condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with any preceding claim which additionally comprises one or more of a plasticizer or extender in an amount of from 5 to 30 wt. % of the composition, rheology modifiers, adhesion promoters, chain extenders, coloring agents and biocides.

8. A method of preparing a condensation curable silicone elastomer composition capable of cure to an elastomeric material comprising the steps of (1) mixing physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, with an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC for a suitable period to enable said organopolysiloxane polymer swelling agent (v)(ii) to penetrate and swell said physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates physically recycled and / or reclaimed(v)(i) to form component (v); (2) forming a step (2) mixture comprising component (v), at least part of component (i) and optionally one or more of components (ii), (iii) and / or (iv) wherein (i) Organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, wherein at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule having a viscosity of from 750 to 150,000mPa.s at 25oC, (ii) a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in polymer (i) (iii) One or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; and (iv) a condensation cure catalyst; (3) mixing the step (2) mixture with the remainder of components (ii), (iii) and / or (iv) wherein to produce a condensation curable silicone elastomer composition; (4) applying the condensation curable silicone elastomer composition onto and / or into a substrate;(5) curing said composition on or in said substrate for a predetermined time.

9. A method in accordance with claim 8 wherein step (1), step (2) and optionally step (3) are undertaken together as a single step.

10. A method in accordance with claim 8 or 9 wherein component (v)(i) are physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates obtained from silicone rubber elastomers prepared from hydrosilylation curable compositions, peroxide free-radical cure compositions or UV cured compositions.

11. A method in accordance with claim 8, 9, or 10 wherein the physically recycled and / or reclaimed high temperature vulcanized (HTV) elastomeric silicone rubber particulates physically recycled and / or reclaimed (v)(i) are prepared by grinding, milling, or pulverizing silicone elastomers into particulates.

12. A method in accordance with claim 8, 9, 10 or 11 wherein component (v)(ii) has a viscosity of from 100 to 5,000mPa.s at 25oC.

13. An elastomeric material made by curing the composition of any one of claims 1 to 7 or by curing a condensation curable silicone elastomer composition made in accordance with the method of claims 8 to 12.

14. A substrate on or in which is a cured product of a condensation curable silicone elastomer composition prepared in accordance with the method of any one of claims 8, 9, 10, 11 or 12.

15. A use of physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) having an average unswollen particle size of less than 1 mm, which physically recycled and / or reclaimed high temperature vulcanized (HTV) silicone rubber particulates (v)(i) have been penetrated and swollen by an organopolysiloxane polymer swelling agent (v)(ii) having a viscosity of less than or equal to (≤) 15,000 mPa.s at 25oC; in a condensation curable silicone elastomer composition otherwise comprising: (i) Organopolysiloxane polymer (i) having an average of least one hydroxyl or hydrolysable group per molecule, wherein at least 25 wt. % of said organopolysiloxane polymer (i) having at least two hydroxyl or hydrolysable groups per molecule having a viscosity of from 750 to 150,000mPa.s at 25oC, (ii) a siloxane and / or silane cross-linker having at least two groups per molecule which are reactable with the hydroxyl or hydrolysable groups in polymer (i); (iii) One or more reinforcing fillers, non-reinforcing fillers or a mixture thereof; and (iv) a condensation cure catalyst; in the preparation of condensation curable silicone elastomer composition capable of cure to an elastomeric material.

16. A method for filling a space between two or more than two substrates, so as to create a seal therebetween, comprising: a) providing a condensation curable silicone elastomer composition capable of cure to an elastomeric material in accordance with any one of claims 1, 2, 3, 4, 56, 7 or 8 and either b) applying the condensation curable silicone elastomer composition to a first substrate, and bringing a second substrate in contact with the silicone composition that has been applied to the first substrate, or c) filling a space formed by the arrangement of a first substrate and a second substrate with the condensation curable silicone elastomer composition and curing the condensation curable silicone elastomer composition.

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