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Articles containing silicone compositions and methods of making such articles

A silicone composition, silicone technology, applied in the direction of adhesives, etc., can solve the problems of manufacturing limitations and inability to obtain at the same time

Inactive Publication Date: 2014-04-23
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] While self-adhesive silicone compositions hold promise for improved adhesion to specific substrates, such compositions are typically orders of magnitude more expensive than other silicone formulations
Furthermore, the manufacture of products using such self-adhesive silicone compositions is limited in terms of tailoring such formulations to better suit a specific product or process
As a result, manufacturers are often left with the choice between desired adhesive properties or desired mechanical properties, but not both

Method used

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  • Articles containing silicone compositions and methods of making such articles
  • Articles containing silicone compositions and methods of making such articles
  • Articles containing silicone compositions and methods of making such articles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Five formulations were prepared for performance studies. Specifically, three vinyl-containing silsesquioxanes were added to two commercial LSR formulations. These vinyl-containing silsesquioxanes are commercially available from Gelest. The technical data of the vinyl-containing silsesquioxanes are shown in Table 1. Silicon LSRs are Wacker product 3003 / 50 and Rhodia product 4340. Formulation data are shown in Table 2. The low viscosity vinyl-containing silsesquioxanes are readily incorporated into the LSR in a two-part mixing step using a dough mixer. The filling amount of the additive is between 0.5% and 2% by weight (phr, parts per hundred parts of rubber) of the LSR.

[0055] Table 1. Properties of Silsesquioxane In-Situ Adhesion Promoters

[0056]

Alkoxy

Density (g / cm 3 )

Viscosity (cSt)

VEE-005

Ethoxy

1.02

4-7

VMM-010

Methoxy

1.10

8-12

VPE-005

Ethoxy

1.02

3-7

[...

Embodiment 2

[0063] Formulations 1-5 were evaluated for adhesive performance on thermoplastic substrates. Thermoplastic substrates include the following: two commercial polycarbonate substrates - GE Lexan and Bayer Sheffield, polyetheretherketone (PEEK) substrate, polyester substrate and polyetheramide Imine substrate (GE Alter). Self-adhesive films with a thickness of about 0.5 mm to about 1.5 mm were compression molded on the substrate under the same molding conditions as the physical test pieces described in Example 1. A mylar film was molded on the backside of the silicone rubber in the same procedure to prevent elongation in the peel test. The peel test uses an Instron 4465 testing machine. Clamp the silicone layer and substrate in Instron chucks. The chuck is then moved vertically at a rate of 2 in / min, which pulls the silicone and substrate 180 degrees apart. The results of the 180° peel test are summarized in Tables 4 and 5. Table 4 illustrates the peel strength before treatme...

Embodiment 3

[0070] Formulations 1 and 5 were evaluated for adhesive performance on thermoset polymers. Thermoset polymer substrates included the following: extrusion grade HCR rubber (Wacker 4105 / 40), acrylic (Purex Glass) and phenolic resin (Garolite). A self-adhesive LSR film with a thickness of about 0.5 mm to about 1.5 mm was compression molded on the substrate under the same molding conditions as the physical test pieces described in Example 1. The results of the peel test are summarized in Table 6 and Table 7. Table 6 illustrates the peel strength before treatment and Table 7 contains the peel strength after 4 hours post cure at 177°C.

[0071] Table 6. Peel strength before treatment

[0072] Peel strength (ppi)

HCR Rubber

Phenolic Resin

Acrylic

Preparation 1

C.F.

C.F.

CF

Preparation 5

C.F.

C.F.

/

[0073] Table 7. Peel strength after post-curing treatment

[0074] Peel strength (ppi)

HCR Rubber

...

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Abstract

The disclosure is directed to a method of making a silicone composition includes mixing a silicone formulation in a mixing device and adding an in situ adhesion promoter to the mixing device. The disclosure is further directed to articles made from the above-mentioned silicone composition.

Description

technical field [0001] The present disclosure generally relates to methods of making silicone compositions and articles comprising the same. Background technique [0002] Curable silicone compositions are used in a variety of applications ranging from the automotive industry to medical devices. A typical production formulation of a liquid silicone rubber (LSR) composition comprises a multi-component mixture of a vinyl-containing polydiorganosiloxane, a hydrogen-containing polydiorganosiloxane, a catalyst, and a filler. Typically, the manufacturing formulation is a two-part formulation that is mixed together prior to use. After mixing to produce the formulation, the silicone composition is then molded or extruded and vulcanized. [0003] In many cases, silicone compositions are bonded to various substrates, such as polymeric substrates, metallic substrates, or glass substrates. For example, silicone compositions are used as coatings or laminates on a variety of polymeric s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C09J183/04
CPCC08G77/70C08L83/04C08G77/18C09J183/04C08G77/20C08G77/12C08L83/00
Inventor D·L·欧M·W·西蒙
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP