Polypropylene fibers having improved heat-shrinkability and tena

Details Polypropylene fibers having improved heat-shrinkability and tena Polypropylene fibers having improved heat-shrinkability and tena

1983-09-07

1985-12-24

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263481, 526351, 264176F, 2642896, 264DIG28, 264DIG73, C08F 464

Patent

active

045607346

ABSTRACT:
Polypropylene fibers having a much improved percentage heat shrinkage and also an improved tenacity are provided, which fibers comprise a polypropylene resin having a density of 0.905 or more, an isotactic pentad ratio of boiling n-heptane-insoluble portion (P.sub.0) of 0.960 or more and a ratio of pentad having two different kinds of configurations (P.sub.2), of 0.002 (0.2%) or less.

REFERENCES:
patent: 3054652 (1962-09-01), Heumann
patent: 3106442 (1963-10-01), Compostella et al.
patent: 3152380 (1964-10-01), Martin
patent: 3413397 (1968-11-01), Bierbaum et al.
patent: 3705227 (1972-12-01), Fintel et al.
patent: 4283463 (1981-08-01), Shiga et al.
patent: 4499247 (1985-02-01), Chiba et al.

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