Addition reaction curable silicone rubber composition
First Claim
1. An addition reaction curable silicone rubber composition comprising:
- (A) 100 parts by mass of an organopolysiloxane containing at least two alkenyl groups bonded to silicon atoms, represented by an average composition formula (1) shown below;
R1aR2bSiO(4-a-b)/2
(1) (wherein, each R1 group represents an identical or different unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, R2 represents an alkenyl group, a represents a number from 0.96 to 2.00, b represents a number from 0.0001 to 0.5, and a+b represents a number within a range from 1.90 to 2.04), (B) an organohydrogenpolysiloxane represented by an average composition formula (2) shown below;
R3cHdSiO(4-c-d)/2
(2) (wherein, each R3 group represents an identical or different unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, c represents a number from 0.70 to 2.00, d represents a number from 0.01 to 1.2, and c+d represents a number within a range from 1 to
3), in sufficient quantity to provide from 0.4 to 10.0 mols of hydrogen atoms bonded to silicon atoms within said component (B) for every 1 mol of alkenyl groups within said composition, (C) an effective quantity of a platinum-based catalyst, (D) a curing retarder, and (E) an adhesion imparting agent, wherein a blend quantity of said curing retarder of said component (D) is sufficient to ensure that, if a torque value of said composition after standing for 180 minutes at 80°
C. following preparation is deemed 100%, a time required for said torque value to reach 90% is no more than 120 minutes.
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Accused Products
Abstract
Provided is a self-adhesive addition reaction curable silicone rubber composition including (A) 100 parts by mass of an organopolysiloxane containing at least two alkenyl groups bonded to silicon atoms, (B) an organohydrogenpolysiloxane, in sufficient quantity to provide from 0.4 to 10.0 mols of hydrogen atoms bonded to silicon atoms within this component (B) for every 1 mol of alkenyl groups within the entire composition, (C) an effective quantity of a platinum-based catalyst, (D) a curing retarder, and (E) an adhesion imparting agent, in which the blend quantity of the curing retarder of the component (D) is sufficient to ensure that, if a torque value of the composition after standing for 180 minutes at 80° C. following preparation is deemed 100%, the time required for the torque value to reach 90% is no more than 120 minutes. Also provided is a method of bonding a plastic substrate and a silicone rubber, in which the above-stated addition reaction curable silicone rubber composition is cured on the plastic substrate at a temperature of no more than 120° C. The addition reaction curable silicone rubber composition is able to be cured even in the presence of curing inhibiting substances, and is very useful as a silicone adhesive.
45 Citations
12 Claims
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1. An addition reaction curable silicone rubber composition comprising:
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(A) 100 parts by mass of an organopolysiloxane containing at least two alkenyl groups bonded to silicon atoms, represented by an average composition formula (1) shown below;
R1aR2bSiO(4-a-b)/2
(1)(wherein, each R1 group represents an identical or different unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, R2 represents an alkenyl group, a represents a number from 0.96 to 2.00, b represents a number from 0.0001 to 0.5, and a+b represents a number within a range from 1.90 to 2.04), (B) an organohydrogenpolysiloxane represented by an average composition formula (2) shown below;
R3cHdSiO(4-c-d)/2
(2)(wherein, each R3 group represents an identical or different unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, c represents a number from 0.70 to 2.00, d represents a number from 0.01 to 1.2, and c+d represents a number within a range from 1 to
3), in sufficient quantity to provide from 0.4 to 10.0 mols of hydrogen atoms bonded to silicon atoms within said component (B) for every 1 mol of alkenyl groups within said composition,(C) an effective quantity of a platinum-based catalyst, (D) a curing retarder, and (E) an adhesion imparting agent, wherein a blend quantity of said curing retarder of said component (D) is sufficient to ensure that, if a torque value of said composition after standing for 180 minutes at 80°
C. following preparation is deemed 100%, a time required for said torque value to reach 90% is no more than 120 minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification