US 11,851,822 B2
Oil-resistant agent for paper
Yuuki Yamamoto, Osaka (JP); Michio Matsuda, Osaka (JP); Tetsuya Uehara, Osaka (JP); and Hirotoshi Sakashita, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Feb. 8, 2021, as Appl. No. 17/169,842.
Application 17/169,842 is a continuation of application No. PCT/JP2019/036157, filed on Sep. 13, 2019.
Claims priority of application No. 2018-172670 (JP), filed on Sep. 14, 2018; and application No. 2019-039667 (JP), filed on Mar. 5, 2019.
Prior Publication US 2021/0164165 A1, Jun. 3, 2021
Int. Cl. D21H 21/18 (2006.01); C09D 7/65 (2018.01); C08F 220/18 (2006.01); C08F 220/36 (2006.01); C09D 5/00 (2006.01); C09D 103/02 (2006.01); D21H 17/28 (2006.01); D21H 17/37 (2006.01); D21H 19/12 (2006.01); D21H 27/10 (2006.01)
CPC D21H 21/18 (2013.01) [C08F 220/1812 (2020.02); C08F 220/1818 (2020.02); C08F 220/36 (2013.01); C09D 5/00 (2013.01); C09D 7/65 (2018.01); C09D 103/02 (2013.01); D21H 17/28 (2013.01); D21H 17/37 (2013.01); D21H 19/12 (2013.01); D21H 27/10 (2013.01); C08F 2800/20 (2013.01)] 20 Claims
 
1. 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.