Organosilicone polymer solutions

Details Organosilicone polymer solutions Organosilicone polymer solutions

1974-09-06

1977-04-05

Lieberman, Allan

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

260 332SB, 260 334SB, C08K 506, C08L 7508, C08L 8312

Patent

active

040160009

ABSTRACT:
Organosilicone polymers are provided which comprise polysiloxane-polyoxyalkylene block copolymers wherein the polysiloxane blocks are trialkylsiloxyendblocked and contain reoccurring difunctional dialkylsiloxy monomeric units in combination with reoccurring difunctional cyanoalkyl-alkylsiloxy or cyanoalkoxyalkylsiloxy monomeric units, the mol ratio of the dialkylsiloxy units to the cyano-substituted siloxy units being about 10-200:3-100, and wherein the polysiloxane and polyoxyalkylene blocks are joined through an Si--C or an Si--O--C linkage, and from about 20 to about 65 weight per cent of the oxyalkylene units of the polyoxyalkylene blocks are constituted of oxyethylene units. The block copolymers of the invention are effective stabilizers of flexible polyether polyolbased polyurethane foams and offer particular advantage in the formation of flame-retarded foams. Also provided is a particular class of cyano-substituted polyalkylsiloxane hydrides which are useful in the preparation of the aforesaid block copolymers.

REFERENCES:
patent: 3234252 (1966-02-01), Pater
patent: 3657305 (1972-04-01), Morehouse
patent: 3686254 (1972-08-01), Morehouse

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