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US 5,182,072 AGranted
Process for producing a modified ethylene/vinyl acetate copolymer
AssigneeNippon Unicar Company Limited
InventorsKiroku Tsukada, Kunio Kotani
Life of this patent
Estimating the term…
Abstract
A process involving mixing an ethylene/vinyl acetate copolymer and an organopolysiloxane at a temperature of at least 160.degree. C. for a sufficient length of time to provide a melt index of 0.05 to 8 grams per 10 minutes.
Claims8
A process comprising mixing:
- (i) a copolymer of ethylene and vinyl acetate containing about 20 to about 50 percent by weight vinyl acetate based on the weight of the copolymer;
- and, for each 100 parts by weight of copolymer,
- (ii) about 1 to about 5 parts by weight of an organopolysiloxane having a viscosity of at least about 10 centistokes at 23.degree. C.;
- and, optionally,
- (iii) about 0.001 to about 1 part by weight of an organic peroxide
- at a temperature of at least about 160.degree. C. for a sufficient length of time to provide the mixture with a melt index of about 0.05 to about 8.0 grams per 10 minutes.
3 more elements
A process comprising mixing:
- (i) a copolymer of ethylene and vinyl acetate containing about 30 to about 40 percent by weight vinyl acetate based on the weight of the copolymer;
- and, for each 100 parts by weight of copolymer,
- (ii) about 1 to about 5 parts by weight of an organopolysiloxane having a viscosity of about 10 to about 10,000 centistokes at 23.degree. C. and about 250 to about 10,000 siloxane units;
- and, optionally,
- (iii) about 0.002 to about 0.010 part by weight of an organic peroxide
- at a temperature in the range of about 180.degree. C. to about 200.degree. C. for a sufficient length of time to provide the mixture with a melt index of about 0.05 to about 8.0 grams per 10 minutes.
3 more elements
Dependencies are inferred from the claim text.