Modified polysiloxanes and process of preparing them

US4153640A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Hans Deiner · Neusäß, DE
• Bernhard Sandner · Geretsried, DE
• Willy Bernheim · Diedorf, DE

Key dates

• Filing date: Mar 3, 1977
• Grant date: May 8, 1979
• Expiry date: Mar 3, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2962
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of modified polymers, preferable in organic solvents, by radical-initiated polymerization of PA1 (Ia) 70 to 99.9 parts by weight of esters of the formula EQU CH.sub.2 .dbd.C(R)--COOR' (Ia) PA1 in which R is --H or --CH.sub.3 and R' are 1 to 18 C-alkyl radicals, at least 50% by weight of the esters of (Ia) being those in which R' are 1 to 4 C-alkyl radicals, PA1 (Ib) 0, 1 to 20 parts by weight of .omega.-hydroxyalkyl esters of acrylic, methacrylic, maleic and/or fumaric esters, the said dicarboxylic acids are possibly etherified on the second carboxylic group with 1 to 12 C-atoms containing alcohols and PA1 (Ic) 0 to 10 parts by weight of other unsaturated monomers, the sum of (Ia), (Ib) and (Ic) amounting to 100 parts by weight, in the presence of PA1 (II) 5 to 40 parts by weight of terminal blocked alkyl-hydrogen polysiloxanes, the alkyl radicals containing 1 to 4 carbon atoms, with a viscosity of 20 to 1000 cP at 20.degree. C., the ratio of alkyl radicals to hydrogen atoms thereof being from 13 : 1 to 1 : 1, in which ratios the terminal groups are not included. Organic solvents containing the obtained modified polymers and usual curing agents for alky…