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US 9,790,643 B2Granted
Coating emulsion composition, and water/oil-repellent paper and making method
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsYoshihito Osawa, Kenji Yamamoto, Yasunori Watanabe
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Abstract
An organopolysiloxane containing at least two silicon-bonded hydroxyl groups, the reaction product of an amino-containing organoalkoxysilane with a dicarboxylic anhydride, and an organopolysiloxane containing long-chain alkyl and alkoxy groups, but free of hydroxyl groups are emulsified and dispersed in water in the presence of a surfactant to form a coating emulsion composition.
Claims13
A method for preparing a water- and oil-repellent paper sheet, comprising:
- coating a water- and oil-repellent composition primarily comprising an aqueous silicone resin emulsion comprising:
- (a) 100 parts by weight of an organopolysiloxane containing at least two silicon-bonded hydroxyl groups in a molecule;
- (b) 0.5 to 20 parts by weight of a dicarboxylic acid base curing agent;
- (c) 1 to 50 parts by weight of silica;
- (d) 2 to 4 parts by weight of an organopolysiloxane containing C4-C20 alkyl and alkoxy groups, but free of hydroxyl groups, and (e) an effective amount to form an emulsion of a surfactant on at least one surface of a paper substrate so as to give a dry coating weight of at least 1.0 g/m2, for thereby forming a water- and oil-repellent, releasable silicone resin layer,
- the paper substrate being selected from the group consisting of Kraft paper, wood-free paper, paper board, liner, glassine paper and parchment paper.
3 more elements
A method of preparing a water repellent paper sheet comprising coating a paper sheet with a coating emulsion composition comprising:
- (A) 100 parts by weight of an organopolysiloxane containing at least two silicon-bonded hydroxyl groups in a molecule,
- (B) 0.5 to 20 parts by weight of the reaction product of an amino-containing organoalkoxysilane with a dicarboxylic anhydride,
- (C) 1 to 20 parts by weight of an epoxy-containing organoalkoxysilane and/or a partial hydrolyzate thereof,
- (D) 1 to 50 parts by weight of colloidal silica and/or polysilsesquioxane,
- (E) 0 to 10 parts by weight of a curing catalyst, and
- (F) 0.5 to 20 parts by weight of an organopolysiloxane containing C4-C201 alkyl and alkoxy groups, but free of hydroxyl groups, and having the average compositional formula (2):
- wherein R1 is each independently C1-C3 alkyl or phenyl, Q is each independently C4-C20 alkyl, Z is each independently a group of —OR2, —C2H4—Si(OR2)3 or —C3H6—Si(OR2)3 wherein R2 is C1-C6 alkyl, the subscript d is a positive number of 1 to 100, e is a positive number of 1 to 100, f is a positive number of 0.1 to 30, and q is 0, 1, 2 or 3,
- components (A) to (F) being emulsified and dispersed in water in the presence of a surfactant.
5 more elements
Dependencies are inferred from the claim text.