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US 4,052,495 AGranted
Method of obtaining release of polyurethane polymers and compositions therefor
AssigneeDow Corning Corporation
InventorsJohn G. Uhlmann, Joseph A. Colquhoun
Life of this patent
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Abstract
A method of obtaining release of polyurethane polymers from various substrates is disclosed. Compositions which are specifically described siloxane-polyoxyalkylene copolymers give release properties to cured polyurethane polymers.
Claims12
A method of releasing non-cellular cured urethane polymers from substrates, which method consists of
- I. introducing into an uncured non-cellular urethane polymer from 0.5 to 5 weight percent based on the weight of the non-cellular urethane polymer and siloxane-polyoxyalkylene copolymer, a siloxane-polyoxyalkylene copolymer selected from the group consisting of ##STR5## wherein each x has an average value of 3 to 45, each y has an average value of 8 to 198, Me is a methyl radical, wherein --OR.sub.x is a polyoxyalkylene polymer or copolymer wherein R is composed of ethylene radicals or butylene radicals and mixtures of ethylene or butylene radicals with propylene radicals, the amount of ethylene or butylene radicals relative to the propylene radicals being such that the ratio of carbon atoms to oxygen atoms in the total --OR-- block ranges from 2.0/1 to 2.9/1,
- Ii. curing the non-cellular urethane polymer while in contact with a substrate, whereby the siloxane-polyoxyalkylene copolymer is reacted into the non-cellular urethane polymer, and
- Iii. releasing the cured non-cellular urethane-polymer from said substrate.
A composition of matter which consists of
- A. a curable non-celluar urethane polymer;
- B. from 0.5 to 5 weight percent based on the weight of the total composition, of a siloxane-polyoxyalkylene copolymer selected from the group consisting of ##STR6## wherein each x has an average value of 3 to 45, each y has an average value of 8 to 198, Me is a methyl radical, wherein --OR.sub.x is a polyoxyalkylene polymer or copolymer wherein R is composed of ethylene radicals or butylene radicals and mixtures of ethylene or butylene radicals with propylene radicals, the amount of ethylene or butylene radicals relative to the propylene radicals being such that the ratio of carbon atoms to oxygen atoms in the total --OR-- block ranges from 2.0/1 to 2.9/1.
A composition of matter which consists of
- A. a cellular cured urethane polymer containing reacted therein
- B. from 0.5 to 5 weight percent based on the weight of the total composition, of a siloxane-polyoxyalkylene copolymer selected from the group consisting of ##STR7## wherein each x has an average value of 3 to 45, each y has an average value of 8 to 198, Me is a methyl radical, wherein --OR.sub.x is a polyoxyalkylene polymer or copolymer wherein R is composed of ethylene radicals or butylene radicals and mixtures of ethylene or butylene radicals with propylene radicals, the amount of ethylene or butylene radicals relative to the propylene radicals being such that the ratio of carbon atoms to oxygen atoms in the total --OR-- block ranges from 2.0/1 to 2.9/1.
Dependencies are inferred from the claim text.