US 9,809,929 B2
Polyester for the paper industry
Achim Kohler, Heilbronn (DE); Roman Morschhaeuser, Mainz (DE); John Stuart Cowman, Bradford (GB); and Antonella Leone-Kammler, Muenchenstein (CH)
Assigned to ARCHROMA IP GMBH, Reinach (CH)
Appl. No. 14/421,601
Filed by CLARIANT INTERNATIONAL LTD., Muttenz (CH)
PCT Filed Aug. 3, 2013, PCT No. PCT/EP2013/002331
§ 371(c)(1), (2) Date Feb. 13, 2015,
PCT Pub. No. WO2014/029468, PCT Pub. Date Feb. 27, 2014.
Claims priority of application No. 10 2012 016 461 (DE), filed on Aug. 18, 2012.
Prior Publication US 2015/0204018 A1, Jul. 23, 2015
Int. Cl. D21H 17/53 (2006.01); D21H 11/14 (2006.01); C08G 63/672 (2006.01); D21C 5/02 (2006.01); D21H 21/16 (2006.01)
CPC D21H 17/53 (2013.01) [C08G 63/672 (2013.01); D21C 5/022 (2013.01); D21H 11/14 (2013.01); D21H 21/16 (2013.01); Y02W 30/648 (2015.05)] 19 Claims
 
1. A polyester capable of being used for increasing surface tension and improving hydrophilic behavior of hydrophobic surfaces, wherein said polyester is obtained by polymerization of
a) one or more unsulfonated aromatic dicarboxylic acids and/or salts thereof and/or anhydrides thereof and/or esters thereof, and
b) ethylene glycol,
c) 1,2-propylene glycol, and
d) one or more polyalkylene glycols, and
e) one or more compounds of formula (1)
R1O(CHR2CHR3O)nH  (1)
 where
R1 is a linear or branched, saturated or unsaturated alkyl group of 1 to 22 carbon atoms,
R2 and R3 are each independently hydrogen or an alkyl group of 1 to 4 carbon atoms, and
n is from 1 to 50,
f) in the presence or absence of one or more crosslinking compounds having 3 to 6 functions capable of polycondensation, with the proviso that said components d) are used in weight quantities <80%, based on the weight quantity of the polyesters obtained by polymerization,
wherein the weight fraction of residual monomers in the polyester due to components a) to e) and optionally f) is <1% based on the weight of the polyester.