Polyvinyl acetal resin for coating and ink, and coating and...

Details Polyvinyl acetal resin for coating and ink, and coating and... Polyvinyl acetal resin for coating and ink, and coating and...

2005-08-30

2005-08-30

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S383000, C525S061000, C525S056000

Reexamination Certificate

active

06936662

ABSTRACT:
It is an object of the invention to provide a polyvinyl acetal resin for lacquer and ink, which can suppress the occurrence of coloring and foul odor of the polyvinyl acetal resin itself even when no antioxidant is used at all therein, and a lacquer and ink composition which has excellent color and the high stability of viscosity in storing it for long periods. The invention provides a polyvinyl acetal resin for lacquer and ink synthesized by acetalization reactio of polyvinyl alcohol and an aldehyde, wherein a polymerization degree is 100 to 3,000, a proportion of a residual acetyl group is 25 mol % or less and a proportion of a residual hydroxyl group is 17 to 35 mol %; a content of the residual aldehyde is 100 ppm or less, a content of residual butyric acid is 100 ppm or less, a content of residual 2-ethyl-2-hexenal is 100 ppm, and a content of a residual acid catalyst is 300 ppm or less, and no antioxidant is remained at all therein.

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Patent Abstracts of Japan. vol. 1999, No. 03, Mar. 31, 1999 & JP 10 338713 A (Sekisui Chemical Co., Ltd.), Dec. 22, 1998.

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