Modified poly(organo-organosiloxanes) with comb or block structu

Details Modified poly(organo-organosiloxanes) with comb or block structu Modified poly(organo-organosiloxanes) with comb or block structu

1989-08-03

1991-10-29

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525479, 525100, 528 15, 528 26, 528 31, 528 41, C08F28312

Patent

active

050617621

ABSTRACT:
The invention relates to modified poly(organo-organosiloxanes) with comb and/or block structures, which consist of a substantially linear diorganopolysiloxane base with organic polymers based on acrylates arranged in terminal positions and/or along the chain. These block polymers can be prepared by a two-step process. In a first process step, alkenyl trialkylsilylacetates are added to polyorgano-H-siloxanes in the presence of, for example, platinum catalysts and in a second process step, polar compounds, such as acrylates or methacrylates are graft copolymerized onto the polyorganosiloxanes modified with trialkylsilylacetoxyalkyl groups obtained above, in the presence of, for example, nucleophilic catalysts according to the principle of the group-transfer method. In a similar process, the polar compounds can be polymerized by the group-transfer method with alkenyl trialkylsilylacetates and the polymeric acrylic compounds modified with terminal acetoxyalkenyl groups thus obtained can be added to the polyorgano-H-siloxanes.

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patent: 4504231 (1985-03-01), Koblitz et al.
patent: 4771109 (1988-09-01), Eichenauer et al.
patent: 4826893 (1989-05-01), Yamazaki et al.

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