Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2002-04-23
2004-07-27
Hampton Hightower, P. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S170000, C528S335000, C528S322000, C528S332000, C528S323000, C525S420000, C525S433000, C525S435000, C525S439000, C525S462000, C525S467000
Reexamination Certificate
active
06767988
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to polyamide elastomer having high flexibility and high heat resistance in addition to good physical characteristics of the known polyamide elastomers.
BACKGROUND OF THE INVENTION
It is well known that polyamide elastomers comprising hard segments derived from polyamide and soft segments derived from polyethers has good physical characteristics such as high impact-recovery resilience, and low temperature flexibility. For instance, U.S. Pat. No. 4,331,786 describes polyether-ester-amide block copolymer.
However, the known polyamide elastomers having hard segments of polyamide and soft segment of polyether has disadvantageous characteristics such as low heat resistance and noticeable yellowing.
Japanese Patent Provisional Publication 8-134210 describes polyamide elastomer comprising hard segments derived from aromatic amides and soft segments derived from aliphatic polyesters, aliphatic polycarbonates, aliphatic polyether carbonate, or polyorganosiloxane and having a weight average molecular weight of 30,000 to 1,000,000.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a polyamide elastomer having high flexibility and high heat resistance in addition to good physical characteristics of the known polyamide elastomers.
The present invention resides in polyamide elastomer comprising units derived from polyamide-forming monomers having no divalent aromatic group, units derived from polycarbonate diols, and units derived from dicarboxylic acids.
The invention further resides in polyamide elastomer comprising units derived from aliphatic polyamides having a carboxylic acid group at each end thereof, and units derived from polycarbonate diols.
The invention furthermore resides in polyamide elastomer comprising aliphatic polyamide units in an amount of 15 to 95 weight %, polycarbonate diol units, and dicarboxylic acid units.
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patent: 4331786 (1982-05-01), Foy et al.
patent: 4649180 (1987-03-01), Chen et al.
patent: 4663428 (1987-05-01), Okitu et al.
patent: 4673727 (1987-06-01), Miller, Jr.
patent: 5173543 (1992-12-01), Bott et al.
patent: 6297345 (2001-10-01), Okushita et al.
patent: 10-292037 (1998-11-01), None
European Search Report, Application No. 02008289.7-2115, Mailing Date: Aug. 9, 2002.
Muramatsu Tadao
Okushita Hiroshi
Costellia Jeffrey L.
Hampton Hightower P.
Nixon & Peabody LLP
UBE Industries Ltd.
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