Paper coating composition
AssigneeJapan Synthetic Rubber Co., Ltd.
InventorsShin-ichiro Iwanaga, Shigeru Shingae, Takasi Morita, Osamu Ishikawa, Norichika Nojima
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Abstract
A paper coating composition which comprises as a binder a latex of a copolymer (referred to hereinafter the particle A) consisting of (a) 20 to 80% by weight of an aliphatic conjugated diene monomer unit, (b) 0.5 to 10% by weight of an ethylenically unsaturated carboxylic acid monomer unit and (c) 20 to 79.5% by weight of a unit of another monomer copolymerizable with the above components (a) and (b) and having two glass transition points in the range of from -100.degree. C. to 50.degree. C. the difference between the two transition points being at least 5.degree. C.
Claims9
A paper coating composition which comprises as a binder a latex of a particle A consisting of (a) 20 to 80% by weight of aliphatic conjugated diene monomer units, (b) 0.5 to 10% by weight of ethylenically unsaturated carboxylic acid monomer units and (c) 20 to 79.5% by weight of units of one or more additional monomers copolymerizable with the above monomers (a) and (b) wherein (a)+(b)+(c)=100% by weight and having two glass transition points in the range of from -100.degree. C. to 50.degree. C., and wherein said particle A has a core-shell structure where said core consists of 20 to 70% by weight of a portion (1) in which the glass transition point is in the range of from -100.degree. C. to 0.degree. C. and said shell consists of 30-80% by weight of another portion (2) in which the glass transition point is in the range of from -5.degree. C. to 50.degree. C., and wherein the difference between the two glass transition points is 10.degree. to 100.degree. C., and wherein a weight average molecular weight of said particle A is at least 40,000, and wherein a weight average molecular weight of said shell is at least 40,000.
Dependencies are inferred from the claim text.