Polymethylpentene/polypropylene blend and film
First Claim
1. A release film comprising a blend of:
- (A) from about 90% to about 10% by weight of polymethylpentene, wherein the polymethylpentene has a molecular weight from about 200,000 to about 700,000, and a melt flow rate between from about 30 grams/10 minutes to about 200 grams/10 minutes; and
(B) from about 10% to about 90% by weight of polypropylene, wherein the polypropylene has a weight average molecular weight from about 150,000 to about 350,000, and a melt flow rate between from about 1 gram/10 minutes to about 10 grams/10 minutes;
whereby the blend of (A) and (B) has an elongation greater than about 250% and a release load less than about 0.60 lb/in.
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Abstract
The present invention provides a composition comprising a blend of:
(A) from about 90% to about 10% by weight of polymethylpentene, wherein the polymethylpentene has a molecular weight between from about 200,000 to about 700,000, and a melt flow rate between from about 20 grams/10 minutes to about 200 grams/10 minutes;
(B) from about 10% to about 90% by weight of polypropylene, wherein the polypropylene has a molecular weight between from about 150,000 to about 350,000, and a melt flow rate between from about 1 gram/10 minutes to about 10 grams/10 minutes;
whereby the blend of (A) and (B) has improved elongation and improved release properties.
The invention further provides a blend with improved tensile strength, improved elongation, and improved release properties, and a method of producing a article with improved release properties from the blend.
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Citations
16 Claims
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1. A release film comprising a blend of:
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(A) from about 90% to about 10% by weight of polymethylpentene, wherein the polymethylpentene has a molecular weight from about 200,000 to about 700,000, and a melt flow rate between from about 30 grams/10 minutes to about 200 grams/10 minutes; and (B) from about 10% to about 90% by weight of polypropylene, wherein the polypropylene has a weight average molecular weight from about 150,000 to about 350,000, and a melt flow rate between from about 1 gram/10 minutes to about 10 grams/10 minutes; whereby the blend of (A) and (B) has an elongation greater than about 250% and a release load less than about 0.60 lb/in. - View Dependent Claims (2, 3, 4, 5, 11, 12, 13)
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6. A process for producing a release film comprising the step of:
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extruding a film from a composition comprising a blend of; (A) from about 90% to about 10% by weight of polymethylpentene, wherein the polymethylpentene has a weight average molecular weight from about 200,000 to about 700,000, and a melt flow rate between from about 30 grams/10 minutes to about 200 grams/10 minutes; and (B) from about 10% to about 90% by weight of polypropylene, wherein the polypropylene has a weight average molecular weight from about 150,000 to about 350,000, and a melt flow rate between from about 1 gram/10 minutes to about 10 grams/10 minutes; whereby the blend of (A) and (B) has an elongation greater than about 250% and a release load less than about 0.60 lb/in. - View Dependent Claims (7, 8, 9, 10, 14, 15, 16)
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Specification