Quenching post cure

A method of thickening solvents comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R.sub.3 SiO(R'.sub.2 SiO).sub.a (R"HSiO).sub.b SiR.sub.3 and optionally an .tbd.Si--H containing polysiloxane of formula HR.sub.2 SiO(R'.sub.2 SiO).sub.c SiR.sub.2 H or formula HR.sub.2 SiO(R'.sub.2 SiO).sub.a (R"HSiO).sub.b SiR.sub.2 H where R, R', and R" are alkyl groups of 1-6 carbon atoms;

• a is 0-250;
• b is 1-250;
• and c is 0-250;
• with (B) an alpha, omega-diene of formula CH.sub.2 .dbd.CH(CH.sub.2).sub.x CH.dbd.CH.sub.2 where x is 1-20;
• conducting the reaction in the presence of a platinum catalyst and (C) a solvent selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom;
• continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene;
• adding additional solvent and a post cure quenching agent to the gel;
• and subjecting the solvent, the post cure quenching agent, and the gel to shear force until a paste is formed;
• the post cure quenching agent being selected from the group consisting of vinyl-t-butyldimethylsilane, vinyldiethylmethylsilane, vinylethyldimethylsilane, vinyltriethylsilane, vinyltrimethylsilane, divinyldimethylsilane, divinyltetramethyldisilane, vinylpentamethyldisiloxane, 1,3-divinyltetramethyldisiloxane, vinyltrisiloxane (CH.sub.3).sub.3 SiOSi(CH.dbd.CH.sub.2)(CH.sub.3)OSi(CH.sub.3).sub.3, 1,5-divinylhexamethyltrisiloxane, and divinylsiloxane oligomer (CH.sub.2 .dbd.CH)Me.sub.2 SiO(Me.sub.2 SiO).sub.8 SiMe.sub.2 (CH.dbd.CH.sub.2).