US 11,851,822 B2Granted

Oil-resistant agent for paper

AssigneeDaikin Industries, Ltd.

InventorsYuuki Yamamoto, Michio Matsuda, Tetsuya Uehara, Hirotoshi Sakashita

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Abstract

An oil-resistant agent for paper, which contains a non-fluorine copolymer that has a repeating unit formed from (a) an acrylic monomer having a long-chain hydrocarbon group with 7-40 carbon atoms and a repeating unit formed from (b) an acrylic monomer having a hydrophilic group. The oil-resistant agent for paper also contains a liquid medium that is composed of water and/or an organic solvent, preferably of water or a mixture (aqueous medium) of water and an organic solvent. The non-fluorine copolymer preferably has a repeating unit formed from (c) a monomer having an ion donor group in addition to the repeating units formed from the monomers (a) and (b). Also disclosed is an oil-resistant paper having an oil-resistant layer including the oil-resistant agent for paper, and starch or modified starch, on a surface of the paper as well as a method of treating paper.

Claims20

Dependent claims

An oil-resistant agent for paper, comprising a fluorine-free copolymer having:

(a) a repeating unit formed from an acrylic monomer having a long-chain hydrocarbon group having 7 to 40 carbon atoms, and
(b) a repeating unit formed from an acrylic monomer having a hydrophilic group,
wherein
the acrylic monomer having a hydrophilic group (b) is at least one compound represented by the formula selected from the group consisting of:
CH2═CX2C(═O)—O—(RO)nX3 (b1),
CH2═CX2C(═O)—O—(RO)n—C(═O)CX2═CH2 (b2), and
CH2═CX2C(═O)—NH—(RO)n—X3 (b3)
wherein
X2 each is independently a hydrogen atom or a methyl group,
X3 each is independently a hydrogen atom, an unsaturated or saturated hydrocarbon group having 1 to 22 carbon atoms,
R is an alkylene group having 2 to 6 carbon atoms, and
n is an integer of 1 to 90,
wherein
an amount of the repeating unit formed from the monomer (b) is 5 to 70% by weight, based on the copolymer.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/169,842Filed 8 Feb 2021 · continuation
Priority: JP 2018-17267014 Sep 2018
Published: US 2021/0164165 A13 Jun 2021
Granted: 26 Dec 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

D21H 21/18
Characterised by function or properties in or on the paper: reinforcing agents
C08F 220/1812
With acrylic or methacrylic acids: c12-acrylate, e.g. lauryl acrylate
C08F 220/1818
With acrylic or methacrylic acids: c13or longer chain acrylate, e.g. stearyl acrylate
C08F 220/36
Esters containing nitrogen , e.g. N,N-dimethylaminoethyl acrylate: containing oxygen in addition to the carboxy oxygen , e.g. 2-N-morpholinoethyl…