Claims
- 1. Propylene polymer yarn of increased resiliency and shrinkage, compared to crystalline polypropylene homopolymer yarn, comprising a continuous strand of multiple monofilament fibers, the composition of matter of said fibers consisting essentially of a member of the group consisting of, amounts being expressed as weight %:
- I. a blend of crystalline polypropylene homopolymer at a concentration of about 10-70% of the blend, and (a) a random crystalline terpolymer consisting essentially of about 96.0-85.0% of propylene, about 1.5-15.0% of ethylene, and about 2.5-10% of a C.sub.4 -C.sub.8 alpha-olefin or (b) a random, crystalline, propylene polymer consisting essentially of propylene and about 1.5-20.0% of an olefin selected from the group consisting of ethylene and C.sub.4 -C.sub.8 alpha-olefins; and
- II. propylene polymer material optionally in a blend with crystalline, polypropylene homopolymer, said homopolymer being at a concentration up to about 70% of the blend, said propylene polymer material being selected from the group consisting of:
- (a) a composition of random, crystalline, propylene polymers consisting essentially of:
- (1) about 30-65% of a copolymer of about 80-98% propylene, and a C.sub.4 -C.sub.8 alpha-olefin, and
- (2) about 35-70% of a copolymer of propylene and ethylene and optionally about 2-10% of a C.sub.4 -C.sub.8 alpha-olefin, said copolymer containing about 2-10% ethylene when said C.sub.4 -C.sub.8 alpha-olefin is not present, and about 0.5-5% ethylene when said C.sub.4 -C.sub.8 alpha-olefin is present;
- (b) a composition of random, crystalline, propylene polymers and a predominantly ethylene copolymer, which composition consists essentially of:
- (1) about 15-35% of a terpolymer of about 90-93% propylene, about 2-3.5% ethylene, and about 5-6% C.sub.4 -C.sub.8 alpha-olefin,
- (2) about 30-75% of a copolymer of about 80-90% propylene, and a C.sub.4 -C.sub.8 alpha-olefin, and
- (3) about 20-60% of a copolymer of about 91-95% ethylene, and a C.sub.4 -C.sub.8 alpha-olefin;
- (c) a heterophasic, polyolefin composition consisting essentially of:
- (1) 90-55% of polymeric material selected from the group consisting of a polypropylene homopolymer having an isotactic index greater than 90, and a crystalline copolymer of propylene and an alpha-olefin of the formula CH.sub.2 .dbd.CHR, where R is H or C.sub.2 -C.sub.6 alkyl, said olefinic material being less than 10% of the copolymer, and
- (2) 10-45% of an elastomeric polymer of propylene and olefinic material selected from the group consisting of alpha-olefins of the formula CH.sub.2 .dbd.CHR, where R is H or C.sub.2 -C.sub.6 alkyl, said olefinic material being 50-70% of said elastomeric copolymer, and 10-40% of said elastomeric copolymer being insoluble in xylene at ambient temperature.
- 2. The yarn of claim 1 comprising from about 50 to about 250 fibers, said fibers being in twisted-together, bulked and heat-set condition to form a carpet yarn.
- 3. The yarn of claim 2 having from about 0.5 to about 6.0 twists per linear inch.
- 4. The yarn of claim 2 wherein the cross-section of each of said fibers is substantially round.
- 5. The yarn of claim 2 wherein the cross-section of each of said fibers is substantially n-lobal with n being an integer of at least 2.
- 6. The yarn of claim 2 wherein said fibers are pigmented.
- 7. The yarn of claim 2 wherein said composition of matter consists essentially of the I blend with the propylene content of the terpolymer being about 91.7-93.3%, the ethylene content being about 2.2-2.7%, and the C.sub.4 -C.sub.8 alpha-olefin is butone-1 at about 4.5-5.6%.
- 8. The yarn of claim 1 wherein the composition of matter of the fibers consists essentially of member II with the propylene polymer material being in a blend with crystalline, polypropylene homopolymer, which homopolymer is at a concentration of about 10-70%.
- 9. The yarn of claim 1 in which the fibers consists essentially of member II with the propylene polymer material consisting essentially of the (d) heterophasic, polyolefin composition, the concentration of the polymeric material thereof being 80-60%, and the concentration of the elastomeric polymer thereof being 20-40%.
- 10. The yarn of claim 5 wherein the lobes have longitudinal cavities of substantially equal cross-section.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI92A1336 |
May 1992 |
ITX |
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Parent Case Info
The application is a continuation of the U.S. application Ser. No. 07/993,951, filed Jan. 7, 1993 now abandoned, which in turn is a continuation-in-part of the U.S. application Ser. No. 07/824,661, filed Jan. 23, 1992 now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
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63-95209 |
Apr 1988 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
993951 |
Jan 1993 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
824661 |
Jan 1992 |
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