Microgel-containing composition

a technology of composition and microgel, applied in the field of microgel-containing composition, can solve the problems of inability to prepare tpes, and achieve the effects of improving mechanical properties of composition, improving properties, and dimensional stability and transparency

Inactive Publication Date: 2007-08-16
LANXESS DEUTDCHLAND GMBH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019] Furthermore, it has been surprisingly found not only that the incorporation of microgels into thermoplastic plastics permits the production of thermopastic elastomers, but also that the incorporation of microgels into, for example, thermoplastic elastomers produced by conventional processes allows a targeted improvement in their properties, such as, for example, dimensional stability and transparency.
[0020] The compositions according to the present invention can be prepared on an industrial scale by a simple process, without using microgels crosslinked by high-energy radiation. The microgels used according to the present invention permit a less immediate change in modulus between the matrix phase and the dispersed phase, which leads to an improvement in the mechanical properties of the composition.
[0021] Also surprisingly, the physical properties, such as, for example, transparency and oil resistance, can be improved when using thermoplastic elastomers as component (A).

Problems solved by technology

This is not possible in the TPEs prepared by conventional processes, in which the dispersed phase is formed in situ during the production of the TPEs.

Method used

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Examples

Experimental program
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Effect test

preparation example 1

(NBR-based Microgel from Peroxidic Crosslinking (OBR 1102 C))

[0132] The preparation of the NBR microgel OBR 1102 C was carried out as described in DE 19701487. An NBR latex was used as starting material. The NBR latex had the following features: content of incorporated acrylonitrile: 43 wt. %, solids concentration: 16 wt. %, pH value: 10.8, diameter of the latex particles (d2): 140 nm, particle density: 0.9984 g / cm3, the gel content of the latex is 2.6 wt. %, the swelling index of the gel portion in toluene was 18.5 and the glass transition temperature (Tg) is −15° C.

[0133] 7 phr of dicumyl peroxide (DCP) was used in the preparation of OBR 1102 C.

[0134] Characteristic data of the resulting microgel are summarized in Table 1.

preparation example 2

(SBR-based Microgel from Peroxidic Crosslinking (OBR 1046 C))

[0135] The preparation of the microgel was carried out by crosslinking an SBR latex containing 40 wt. % of incorporated styrene (Krylene 1721 from Bayer France) in latex form with 1.5 phr of dicumyl peroxide (DCP) and subsequently grafting with 5 phr of hydroxyethyl methacrylate (HEMA).

[0136] The crosslinking of Krylene 1721 with dicumyl peroxide was carried out as described in Examples 1) to 4) of U.S. Pat. No. 6,127,488, 1.5 phr of dicumyl peroxide being used for the crosslinking. The underlying latex Krylene 1721 has the following features: [0137] solids concentration: 21 wt. %; pH value: 10.4; diameter of the latex [0138] particles: d10=40 nm; dz=53 nm; d80=62 nm; Ospec.=121; particle [0139] density: 0.9673 g / cm3, the gel content of the microgel is 3.8 wt. %, the swelling index of the gel portion is 25.8 and the glass transition temperature (Tg) is −31.5° C.

[0140] After reaction with 1.5 phr of dicumyl peroxide, th...

preparation example 3

(SBR-based Microgel from Direct Polymerization; Crosslinking with DVB (OBR1126E)

[0146] The preparation of this microgel was carried out by copolymerization of 23% styrene, 76% butadiene and 1% divinylbenzene in emulsion.

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Abstract

The present invention relates to a composition containing thermoplastic materials and crosslinked microgels that have not been crosslinked by high-energy radiation, to a process for its preparation, to its use in the production of thermoplastically processable molded articles, and to molded articles produced from the composition.

Description

[0001] The present invention relates to a composition containing thermoplastic materials and crosslinked microgels that have not been crosslinked by high-energy radiation, to a process for its preparation, to its use in the production of thermoplastically processable molded articles, and to molded articles produced from the composition. BACKGROUND OF THE INVENTION [0002] The use of microgels for controlling the properties of elastomers is known (e.g. EP-A-405216, DE-A 4220563, GB-PS 1078400, DE 19701487, DE 19701489, DE 19701488, DE 19834804, DE 19834803, DE 19834802, DE 19929347, DE 19939865, DE 19942620, DE 19942614, DE 10021070, DE 10038488, DE 10039749, DE 10052287, DE 10056311 and DE 10061174). EP-A-405216, DE-A-4220563 and GB-PS-1078400 disclose the use of CR, BR and NBR microgels in mixtures with double-bond-containing rubbers. DE 19701489 describes the use of subsequently modified microgels in mixtures with double-bond-containing rubbers such as NR, SBR and BR. [0003] None o...

Claims

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Application Information

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IPC IPC(8): C08F8/00C08L21/00C08L23/10
CPCC08L21/00C08L23/10C08L2666/02C08L2666/08
InventorHEILIGER, LUDGERFRUH, THOMASMULLER, VOLKERTEBBE, HEIKOOBRECHT, WERNERSCHUSTER, ROBERT HANSMULLER, MARTIN
OwnerLANXESS DEUTDCHLAND GMBH