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US 12,637,557 B2Granted
High crystalline olefin polymer for high speed spinning
AssigneeW.R. Grace & Co.-Conn.
InventorJohn Kaarto
Life of this patent
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Abstract
A polymer composition includes a low ethylene random copolymer that can be used to form a meltspun or spunbond article at high spinning velocities. The polymer composition has a low xylene soluble content, a high crystallinity, or both, while having reduced spin-break at high spinning velocities. The polymer composition also exhibits good fiber tenacity and fabric softness.
Claims20
A polymer composition for forming a melt spun web, the polymer composition comprising:
- a propylene and α-olefin random copolymer;
- wherein:
- the random copolymer comprises α-olefin monomer units in an amount less than 1% by weight;
- the random copolymer having been peroxide cracked;
- the random copolymer exhibiting a rheological polydispersity index of 3 or less after peroxide cracking, a xylene solubles content of 2.7 wt. % or less prior to peroxide cracking, and a crystallinity of 55% or greater after peroxide cracking;
- and the polymer composition exhibits a melt flow rate of 20 dg/minute or greater (according to ASTM D1238, at 2300 C with a load of 2.16 kg).
3 more elements
Dependencies are inferred from the claim text.