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...
Reexamination Certificate
2007-03-06
2007-03-06
Page, Thurman K. (Department: 1621)
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...
C568S700000, C525S059000
Reexamination Certificate
active
10503949
ABSTRACT:
The present invention relates to a method for increasing the heat-resistant of ethylene-vinyl alcohol copolymer (EVOH), the method is characterized by using a mixture of acetic acid, magnesium dihydrogen phosphate, and potassium dihydrogen phosphate at a certain ratio as an acid-treating solution in the acid-treating procedure of a process for preparing EVOH. The EVOH produced by the method of the present invention exhibits an excellent heat-resistance and does not become yellowing attributed to the elevated processing temperature. Also, the EVOH generated by the method of the present invention exhibits a uniform heat-resistance since the additives are dispersed evenly in the EVOH.
REFERENCES:
patent: 6340645 (2002-01-01), Horacek et al.
patent: B 46-37664 (1971-11-01), None
patent: B 55-19242 (1980-05-01), None
patent: B 57-5834 (1982-02-01), None
patent: 11152307 (1999-06-01), None
Chang Huan Ming
Fan Kuang Hui
Lin Li Shing
Lin Weng Shing
Tsai Jing Jin
Bacon & Thomas PLLC
Chang Chun Petrochemical Co., Ltd.
Nwaonicha Chukwuma
Page Thurman K.
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