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Highly elastomeric and paintable silicone compositions

a silicone composition and high-elastomer technology, applied in the field of high-elastomeric and paintable silicone compositions, can solve the problems of low elasticity, low tensile elongation, unpaintable, etc., and achieve the effect of superior weathering properties and excellent paintability

Inactive Publication Date: 2005-12-29
TREMCO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The organopolysiloxane compositions of the present invention comprise an organic polymer, an organic oligomer, or combinations of an organic polymer and an organic oligomer; an organopolysiloxane polymer; and a crosslinker. The compositions may further comprise other additives to modify the properties of the organopolysiloxanes. The organic polymer can be a homopolymer, a copolymer and mixtures thereof having reactive or non-reactive terminal groups. It has been discovered that such compositions, when cured, produce a silicone sealant that exhibits excellent paintability and superior weathering properties.

Problems solved by technology

A disadvantage of cured silicone compositions, however, is that they are considered to be unpaintable.
The surface of the cured sealant has improved paintability, but the addition of the acicular calcium carbonate results in other problems such as low elasticity.
The generally high loading of calcium carbonate necessary to achieve improved paintability deleteriously affects the elasticity of the silicone sealant such that its tensile elongation is lower than desired.
However, plasticizers detract from the paintability of the silicone sealant.

Method used

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  • Highly elastomeric and paintable silicone compositions
  • Highly elastomeric and paintable silicone compositions
  • Highly elastomeric and paintable silicone compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] In this example, about 43% organic polymer (based on the total weight of organic and inorganic polymer) was used to prepare a medium modulus sealant with a shore-A of 15. The organic polymer comprised a silyl terminated polyurethane. The amounts are listed in Table 1 below.

TABLE 1WeightCompositionPercent  2400 cps. silanol terminated dimethylpolysiloxane10.4450,000 cps. silanol terminated dimethylpolysiloxane polymer23.43Soft acrylic filler (thixotrope)19.38Hydrophobic treated precipitated calcium carbonate5.86Hexamethyldisilazane0.35Hydrophobic treated ground calcium carbonate2.34Acrylic functional plasticizer7.14Dimethylbis-secondary butylaminosilane0.64Methyltris-methylethylketoximosilane3.99A trimethoxysilylalkyl terminated polyurethane25.56Aminoethylaminopropyltrimethoxysilane0.86Dibutyltindilaurate0.01TOTAL100.00

[0051] The above composition was painted after curing, yielding a smooth painted surface having no “fish eyes.” The above composition passed the paint adhesio...

example 2

[0052] In this example, about 29% (by weight, based on total polymer) organic polymer was used to prepare a medium modulus sealant with a shore-A of 15. The organic polymer comprised a silyl terminated polyether polymer as shown in Table 2. This composition was designed to give a paintable fast curing silicone sealant having medium modulus properties combined with excellent adhesion properties on plastics, glass and anodized aluminum.

TABLE 2WeightCompositionPercent50,000 cps. silanol terminated dimethylpolysiloxane polymer25.4620,000 cps. silanol terminated dimethylpolysiloxane polymer16.97Hydrophobic treated precipitated calcium carbonate33.94Hexamethyldisilazane0.85Dimethylbis-secondary butylaminosilane2.25Vinyitris-methylethylketoximosilane1.70Alkoxy silyl terminated polyether16.97Aminoethylaminopropyltrimethoxysilane1.80Dibutyltindiacetate0.06TOTAL100.00

[0053] The unpainted composition upon curing had a tack free of time of 15 minutes accompanied by tooling time of 9 minutes. ...

example 3

[0054] In this example, about 24% (by weight, based on total polymer) organic polymer was used to prepare a medium modulus sealant. The organic polymer comprised a silyl terminated polyether polymer as shown in Table 3, below.

TABLE 3WeightCompositionPercent50,000 cps. silanol terminated dimethylpolysiloxane polymer3.8320,000 cps. silanol terminated dimethylpolysiloxane polymer34.51  2400 cps. silanol terminated dimethylpolysiloxane polymer4.02Vinyltris-methylethylketoximosilane1.53Dimethylbis-secondarybutylaminosilane2.037Hexamethyldisilazane0.84Hydrophobic treated precipitated calcium carbonate30.68Soft acrylic filler7.48Alkoxy silyl terminated polyether polymer13.42Aminopropyltriethoxysilane1.63Dibutyltindiacetate0.023TOTAL100.00

[0055] The above composition was painted after curing, yielding a smooth painted surface having no “fish eyes.” The above composition also passed the paint adhesion test while maintaining excellent weatherability as demonstrated with no surface cracks an...

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Abstract

Highly elastomeric, curable, paintable silicone compositions are provided. The paintable silicone compositions comprise an organopolysiloxane, a silicone functional crosslinker, and an organic polymer. The highly elastomeric, curable, paintable silicone compositions have an elongation of at least 150% and are useful as paintable sealants and caulks.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a unique family of one and two component highly elastomeric vulcanizable paintable silicone sealants and extrusions exhibiting high elongation characteristics combined with excellent adhesion and weathering resistance. They can be designed to have a wide range of properties ranging from low modulus to high strength self-adhering curable room temperature vuclanizable (RTV) silicone compositions exhibiting superior paintability and adhesion characteristics while maintaining the outstanding weathering resistance of silicone elastomers. BACKGROUND OF THE INVENTION [0002] Silicone compositions are widely used in the construction industry as well as other industrial applications, such as automotive, electronics, aerospace and consumer markets because these materials possess self-bonding adhesion properties to several types of substrates such as glass, metal, ceramics, fabrics, wood, leather, plastics and paper. In addition, su...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K3/26C08K3/34C08L83/04C08L101/10
CPCC08G77/14C08G77/16C08G77/18C08G77/20C08G77/26C08L75/04C08L101/10C08L83/04C08L2666/14C08L2666/04C09D183/04C08K5/544C08L83/00C08K5/5445C08K3/34C08K2003/2241C08K3/26C08K5/57C08K5/54C08K9/04C08K3/013C08K9/02
Inventor BEERS, MELVIN DALEFENG, TA-MINMISHRA, STEVE S.
Owner TREMCO INC
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