Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2011-06-14
2011-06-14
Sergent, Rabon (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S274000, C528S300000, C528S301000, C528S306000, C528S392000, C528S393000, C528S408000, C528S417000, C528S483000, C528S490000, C560S200000, C560S205000, C560S224000, C568S857000, C568S867000
Reexamination Certificate
active
07960496
ABSTRACT:
Disclosed herein is a novel stabilizer for preparing a polymer polyol, which is used to prepare polyurethane foam having improved physical properties. The stabilizer is prepared by allowing maleic anhydride to react with a polyether polyol, having an OH functionality of 3-8 and a molecular weight of 3,000-15,000, and then adding ethylene oxide to the reaction solution. Because the molecular weight and functionality of the stabilizer are increased through aging and dimerization, the stabilizer has a high molecular weight of 5,000-30,000, a high OH functionality of 6-10 and a viscosity of 3,000-15,000 cps/25° C. A polymer polyol derived from the stabilizer has low viscosity compared to those of prior products and contributes to the improvement in the physical properties of the resulting polyurethane foam.
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Choi Jang Hyun
Choi Jong Yeol
Huh Seung Moo
Lee Jeon Koo
Korea Kumho Petrochemical Co. Ltd.
Sergent Rabon
Steptoe & Johnson LLP
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