Process for producing low shrinkage film bands

Details Process for producing low shrinkage film bands Process for producing low shrinkage film bands

1976-09-13

1978-09-12

Lowe, James B.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

264288, 264DIG73, C08F 1006, B29D 724

Patent

active

041139356

ABSTRACT:
A multistage stretching process for producing low shrinkage film bands of a thermoplastic polymer, especially polypropylene, wherein the stretching temperature is increased from one stage to the next under prescribed conditions for each stage and the stretched bands are then heat stabilized with shrinkage in a relaxed condition at a temperature of about 20.degree. C. to 30.degree. C. below the crystalline melting point of the polymer. The resulting film bands are especially useful in carpet backings.

REFERENCES:
patent: 3076232 (1963-02-01), Dengler
patent: 3619460 (1971-11-01), Chill
patent: 3734994 (1973-05-01), Blecha

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