Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-02-21
1993-09-28
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
524378, 524503, C08G 6348
Patent
active
052487245
ABSTRACT:
A sizing agent for paper, which comprises 100 parts by weight of a polyvinyl alcohol (component A) and from 1 to 20 parts by weight of a compound (component B) provided with the following requisites (1) to (4): (1) the backbone chain is a block copolymer of ethylene oxide and propylene oxide, (2) in the backbone chain, the proportion of oxyethylene units is from 20 to 40% by weight, and the proportion of oxypropylene units is from 60 to 80% by weight, (3) of the two terminals, one terminal is a hydrogen atom bonded to an oxygen atom of an oxyethylene unit or an oxypropylene unit, and the other terminal is a C.sub.1-10 alkoxyl group or a hydrogen atom bonded to an oxygen atom of an oxyethylene unit or an oxypropylene unit, and (4) the weight average molecular weight is from 600 to 1,200.
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Ishiguro Osamu
Nosaka Yoshihumi
Denki Kagaku Kogyo Kabushiki Kaisha
Reddick J. M.
Schofer Joseph L.
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