Patent ID: 6972313

Claim:
A silicone composition crosslinkable by hydrosilylation into an adhesive and cushioning gel, comprising: (I)—at least one polyorganosiloxane POS (I) comprising: end siloxyl units of formula M=(R) 2 (Hrf)SiO 1/2 , at a level of 0.1 to 1 molar %, wherein: R=CH 3 and Hrf=vinyl, and identical or different siloxyl units of formula D=(R 1 ) p (Hrf) q SiO 2/2 , at a level of 99 to 99.9 molar %, wherein R 1 =CH 3 , p=2 and q=0; (II)—at least one polyorganosiloxane POS (II) comprising: identical or different siloxyl units of formula R 2 SiO 2/2 , wherein R is a linear C 1 -C 6 alkyl group, or an aryl group, optionally substituted, end siloxyl units M=(Hrf) s (R 2 ) t SiO 1/2 , at a level of 1 to 6 molar %, wherein units Hrf=H, R 2 =CH 3 , s=1 and t=2 identical or different siloxyl units D=(Hrf) u (R 3 ) v SiO 2/2 , at a level of 10 to 50 molar %, wherein units R 3 =CH 3 , Hrf=H, u=1 and v=1 with the further proviso that at least one of the D units of the POS (II) carries an Hrf(u=1, v=1); (III)—at least one adhesion promoter (III) being an extending linear polyorganosiloxane POS (III) having a dynamic viscosity of less than or equal to 100,000 mPa·s, and exhibiting: end siloxyl units M=(Hrf) w (R 4 ) x SiO 1/2 , at a level of 8 to 20 molar %, wherein units Hrf=H, R 4 =CH 3 , w=1 and x=2, with the further proviso that the Hrfs of the POS (III) react at least with the Hrfs of the end M units of the POS (I), that the ratio: r 1 = number ⁢ ⁢ of ⁢ ⁢ Hrf ⁢ ⁢ groups ⁢ ⁢ in ⁢ ⁢ the ⁢ ⁢ POS ⁢ ⁢ ( III ) ⁢ number ⁢ ⁢ of ⁢ ⁢ Hrf ⁢ ⁢ groups ⁢ ⁢ in ⁢ ⁢ the POS ⁢ ⁢ ( II ) ⁢ ⁢ and ⁢ ⁢ in ⁢ ⁢ the ⁢ ⁢ POS ⁢ ⁢ ( III ) × 100 is less than or equal to 95%, and that the ratio: r 2 = number ⁢ ⁢ of ⁢ ⁢ Hrf ⁢ ⁢ groups ⁢ ⁢ in ⁢ ⁢ the POS ⁢ ⁢ ( II ) ⁢ ⁢ and ⁢ ⁢ in ⁢ ⁢ the ⁢ ⁢ POS ⁢ ⁢ ( III ) number ⁢ ⁢ of ⁢ ⁢ Hrf ⁢ ⁢ groups ⁢ ⁢ in ⁢ ⁢ the ⁢ ⁢ POS ⁢ ⁢ ( I ) is less than or equal to 0.9; and siloxyl units D=(R 5 ) 2 SiO 2/2 , at a level of 80 to 92 molar %, wherein units R 5 =CH 3 ; (IV)—organic hollow microspheres; and (VI)—an effective amount of hydrosilylation catalyst.