Polyester films with improved processability and tear resistance

Details Polyester films with improved processability and tear resistance Polyester films with improved processability and tear resistance

1978-03-30

1981-08-25

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428355, 428480, 428510, 428 35, 428 40, 428212, 525444, B32B 2736, C08J 518

Patent

active

042860113

ABSTRACT:
Polyester films consisting of a homogeneous fused, intimate mixture of polyethylene terephthalate (PET) with sufficient polytetramethylene terephthalate (PTMT) to increase film tear strength in excess of 10%. Mixed PET and PTMT resins are extruded and used to produce unoriented, uniaxially oriented, and biaxially oriented polyester films with significantly increased tear strengths. Increased tear strengths are exhibited at different PET-PTMT weight ratios depending upon the orientation of the film.

REFERENCES:
patent: 3187075 (1965-06-01), Seifried
patent: 3256379 (1966-06-01), Heffelfinger
patent: 3728212 (1973-04-01), Caldwell et al.
patent: 3883611 (1975-05-01), Nelson
patent: 3953394 (1976-04-01), Fox
patent: 3990603 (1976-11-01), Brochman
patent: 4009312 (1977-02-01), Hayashi et al.
patent: 4041206 (1977-08-01), Tsunashima et al.
patent: 4064098 (1977-12-01), Saitoh et al.

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