Claims
- 1. A peelable thermoplastic film comprising:
- a blend for a film having a peel strength of at least about 300 gm/1/2 inch and a thickness of from about 0.0005 inch to about 0.02 inch, said blend including:
- (a) from about 40% to about 60% by weight of an A-B-A block copolymer, said A blocks being derived from polystyrene or a polystyrene homolog, said B blocks comprising an ethylene butene random copolymer, said block copolymer including approximately 30% by weight mineral oil;
- (b) from about 20% to about 50% by weight of an ethylene vinyl acetate copolymer; and
- (c) about 10% by weight of an erucamide anti-block concentrate.
- 2. The film of claim 1 further comprising from about 1% to about 10% by weight of a second anti-block concentrate, said second anti-block concentrate comprising a blend of polyethylene and silica.
- 3. The film of claim 1 wherein said ethylene vinyl acetate copolymer comprises approximately 28% by weight vinyl acetate.
- 4. The film of claim 1 wherein said film has a haze index from about 65% to about 90%.
- 5. The film of claim 1 wherein said erucamide anti-block concentrate comprises approximately 7% by weight erucamide, 20% by weight silica and 73% by weight ethylene vinyl acetate.
- 6. A peelable thermoplastic film comprising:
- a blend for a film having a peel strength of at least about 300 gm/1/2 inch and a thickness of from about 0.0005 inch to about 0.02 inch, said blend including:
- (a) from about 45% to about 55% by weight of an A-B-A block copolymer, aid A blocks being derived from polystyrene or a polystyrene homolog, said B blocks comprising ethylene butene random copolymer, said copolymer including approximately 30% by weight mineral oil;
- (b) from about 25% to about 45% by weight of an ethylene vinyl acetate copolymer; and
- (c) about 10% by weight of an erucamide anti-block concentrate.
- 7. The film of claim 6 further comprising from about 1% to about 10% by weight of a second anti-block concentrate, said second anti-block concentrate comprising a blend of polyethylene and silica.
- 8. The film of claim 6 wherein said ethylene vinyl copolymer comprises approximately 28% by weight vinyl acetate.
- 9. The film of claim 6 wherein said film has a haze index from about 65% to about 90%.
- 10. The film of claim 6 wherein said erucamide anti-block concentrate comprises approximately 7% by weight erucamide, 20% by weight silica and 73% by weight ethylene vinyl acetate.
TECHNICAL FIELD
This application is a continuation of U.S. Ser. No. 07/443,173 filed Nov. 30, 1989, now abandoned.
This invention relates to films that are made from a blend of an elastomeric block copolymer, ethylene vinyl acetate and one or more anti-blocking materials. The films are adapted to form a peelable seal with various substrates including polyvinyl chloride.
US Referenced Citations (10)
Non-Patent Literature Citations (1)
Entry |
U.S. patent application Ser. No. 760,691 (abandoned). |
Continuations (1)
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Number |
Date |
Country |
Parent |
443173 |
Nov 1989 |
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