Graft copolymer for transparent thermoplastic polyurethane...

Details Graft copolymer for transparent thermoplastic polyurethane... Graft copolymer for transparent thermoplastic polyurethane...

2011-06-28

2011-06-28

Cheung, William K (Department: 1762)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C525S232000, C526S335000, C526S336000, C526S317100, C526S346000

Reexamination Certificate

active

07968643

ABSTRACT:
The present invention relates to a graft copolymer for a transparent thermoplastic polyurethane resin prepared by graft copolymerization of (a) 50-85 weight % of rubber latex having a multi-layered structure composed of an inner layer and an outer layer comprising a conjugated diene monomer and an ethylenically unsaturated aromatic compound in which the refractive index of the inner layer is greater than that of the outer layer; and (b) 15-50 weight % of a C2-C20vinyl monomer; a method for making same; and a thermoplastic polyurethane resin composition comprising same having excellent color properties, calendaring properties, low temperature impact strength and transparency.

REFERENCES:
patent: 3049505 (1962-08-01), Grabowski
patent: 4306040 (1981-12-01), Baer
patent: 4317890 (1982-03-01), Goyert et al.
patent: 5614589 (1997-03-01), Niznik et al.
patent: 5852124 (1998-12-01), Wang et al.
patent: 1296513 (2001-05-01), None
patent: 50-014739 (1975-02-01), None
patent: 20040050468 (2004-06-01), None
patent: 2007-0051450 (2007-05-01), None
International Search Report, PCT/KR2008/000040, dated Apr. 16, 2009.
Office Action from corresponding Chinese Application 200880002309.7 dated Jul. 5, 2010.

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