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US 2022/0306864 A1Published application
Moisture curable network silicone polymer and uses thereof
AssigneeHenkel AG & Co. KGaA
InventorsYuxia Liu, Abhijit Hirekerur, Matthew Ahearn, Alfred Decato
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Abstract
The present invention provides moisture curable network silicone polymers and compositions thereof, having improved resistance to automotive oil at high temperature. The network silicone polymers contain terminal moisture curable functional groups and a partially crosslinking structure that contains C—C—C linkage which separates the siloxane backbone from the moisture curable functional groups and prevent thermal decomposition of siloxane backbone.
Claims20
A network silicone polymer prepared with:
- (i) about 10 to about 98% by weight of a vinyl terminated polyorganosiloxane having a weight average molecular weight greater than about 1,000 g/mol, preferably greater than about 10,000 g/mol.;
- (ii) about 1 to about 20% by weight of a hydride terminated polyorganosiloxane having a weight average molecular weight less than about 100,000 g/mol, preferably less than about 10,000 g/mol.;
- (iii) about 0.001 to about 20% by weight of a vinyl or hydride (SiH) multifunctional organic compounds, and
- (iv) about 0.00001 to about 5% by weight of a hydrosilylation catalyst;
- wherein the mole ratio of vinyl functional group over hydride functional group is from about 0.1 to 0.8;
- and
- wherein the average weight molecular weight of the network silicone polymer of this invention is from about 10,000 to 3,000,000 g/mol.
4 more elements
A moisture curable network silicone polymer prepared from a reaction product of comprising:
- (A) a network silicone polymer prepared with:
- (i) about 10 to about 98% by weight of a vinyl terminated polyorganosiloxane having a weight average molecular weight greater than about 1,000 g/mol, preferably greater than about 10,000 g/mol.;
- (ii) about 1 to about 20% by weight of a hydride terminated polyorganosiloxane having a weight average molecular weight less than about 100,000 g/mol, preferably less than about 10,000 g/mol.;
- (iii) about 0.001 to about 20% by weight of a vinyl or hydride (SiH) multifunctional organic compounds, and
- (iv) about 0.00001 to about 5% by weight of a hydrosilylation catalyst;
- wherein the mole ratio of vinyl functional group over hydride functional group is from about 0.1 to 0.8;
- and
- wherein the average weight molecular weight of the network silicone polymer is from about 10,000 to 3,000,000 g/mol and
- (B) an end-capped vinyl functional silane CH2═CH—SiYnR3-n,
- wherein Y is alkoxy, aryloxy, acetoxy, oximino, enoxy, amino, α-hydroxycarboxylic acid amide (—OCR′2CONR″2), α-hydroxycarboxylic acid ester (—OCR′2COOR″), H, OH, halogen, or combination thereof;
- n=1 , 2, or 3;
- and each R, R′ and R″ are independently, alkyl, aryl, fluoroalkyl, trialkylsilyl, triarylsilyl, or combination thereof;
- and
- wherein the ratio of the vinyl functional group in the (B) end-capped vinyl functional silane over the free hydride functional group in the (A) silicone polymer is from about 1 to 1.5.
11 more elements
A moisture cure composition comprising:
- (1) from about 10 to about 90% of a moisture curable silicone polymer prepared from a reaction product of comprising:
- (A) a network silicone polymer prepared with
- (i) about 10 to about 98% by weight of a vinyl terminated polyorganosiloxane having a weight average molecular weight greater than about 1,000 g/mol, preferably greater than about 10,000 g/mol.;
- (ii) about 1 to about 20% by weight of a hydride terminated polyorganosiloxane having a weight average molecular weight less than about 100,000 g/mol, preferably less than about 10,000 g/mol.;
- (iii) about 0.001 to about 20% by weight of a vinyl or hydride (SiH) multifunctional organic compounds, and
- (iv) about 0.00001 to about 5% by weight of a hydrosilylation catalyst;
- wherein the mole ratio of vinyl functional group over hydride functional group is from about 0.1 to 0.8;
- and
- wherein the average weight molecular weight of the network silicone polymer is from about 10,000 to 3,000,000 g/mol and
- (B) an end-capped vinyl functional silane CH2═CH—SiYnR3-n, wherein Y is alkoxy, aryloxy, acetoxy, oximino, enoxy, amino, α-hydroxycarboxylic acid amide (—OCR′2CONR″2), α-hydroxycarboxylic acid ester (—OCR′2COOR″), H, OH, halogen, or combination thereof;
- n=1 , 2, or 3;
- and each R, R′ and R″ are independently, alkyl, aryl, fluoroalkyl, trialkylsilyl, triarylsilyl, or combination thereof;
- and
- wherein the ratio of the vinyl functional group in the (B) end-capped vinyl functional silane over the free hydride functional group in the (A) silicone polymer is from about 1 to 1.5;
- (2) from about 0.00001 to about 5% of a moisture curing catalyst;
- and
- (3) optionally, from about 5 to about 90% of a finely-divided inorganic filler or a mixer of fillers.
14 more elements
Dependencies are inferred from the claim text.