Polymer blends and tapes therefrom
Assignee3M Innovative Properties Company
InventorsRichard A. Kollaja, Steven D. Solomonson, Sarah A. Franzwa
Life of this patent
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Abstract
Tape backing compositions of the present invention comprise a blend of a first relatively flexible and second relative inflexible polymer, the two polymers having a melting temperature of at least about 93° C. (200° F.). Tape backing compositions of the present invention are especially useful for making flexible films and tapes. Such films and tapes advantageously possess properties particularly useful for applications involving elevated temperatures, such as auto paint masking tape applications, where the flexible film is used as a backing. In one embodiment, the backing is chloride-free. In another embodiment, the backing is essentially free of plasticizers.
Claims26
A flexible film, comprising a blend of:
- a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively in flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F. ) and a Young's modulus of greater than 207 MPa.
A hand-tearable flexible film comprising a blend of:
- a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively inflexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of greater than 207 MPa.
A flexible film, comprising:
- a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively inflexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of greater than 207 MPa.
- wherein the film exhibits less than about 5% shrinkage when tested according to ASTM D 1204 at 149° C. (300° F.), the film exhibits greater than about 40% stress relaxation when tested at 10% elongation, the film exhibits greater than about 55% stress relaxation when tested at 57% elongation, and the film exhibits essentially no yield point when tested according to ASTM D882-95a.
A tape comprising:
- a backing comprising a blend of:
- a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively inflexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of greater than 207 MPa;
- and
- an adhesive coated on at least a portion of one side of the backing for adherence to a substrate.
An auto paint masking tape, comprising:
- a chloride-free backing comprising a blend comprising a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively inflexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of greater than 207 MPa;
- and
- an adhesive coated on at least a portion of one side of the backing for adherence to an automobile.
An auto paint masking tape, comprising:
- a backing comprising a blend comprising a first relatively flexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of less than 207 MPa;
- and
- a second relatively inflexible polypropylene polymer comprising at least 95% by weight propylene monomer and having a melting temperature of at least about 149° C. (300° F.) and a Young's modulus of greater than 207 MPa;
- and
- an adhesive coated on at least a portion of one side of the backing for adherence to an automobile,
- wherein the backing is essentially free of plasticizers.
Dependencies are inferred from the claim text.