US 12,391,616 B2
High water reduction powder preparation for dry mortar
Chao Yu, Suzhou (CN); Jiali Zhu, Suzhou (CN); Jianghong Liu, Suzhou (CN); and Lin Chen, Suzhou (CN)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 17/598,349
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Mar. 26, 2020, PCT No. PCT/CN2020/081401
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/192735, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 201910229736.9 (CN), filed on Mar. 26, 2019.
Prior Publication US 2022/0185732 A1, Jun. 16, 2022
Int. Cl. C04B 24/32 (2006.01); C04B 20/00 (2006.01); C04B 28/02 (2006.01); C04B 40/00 (2006.01); C08F 290/14 (2006.01); C08J 3/12 (2006.01)
CPC C04B 24/32 (2013.01) [C04B 20/0016 (2013.01); C04B 28/02 (2013.01); C04B 40/0042 (2013.01); C08F 290/142 (2013.01); C08J 3/122 (2013.01); C08J 2351/08 (2013.01)] 9 Claims
 
1. A process for the production of a powdered copolymer P, said process comprising the steps of
i) preparing an aqueous copolymer solution comprising 30-99 w %, based on the total weight of said aqueous solution, of a PCE-type copolymer comprising
a) a molar parts of a structural unit S1 of formula I

OG Complex Work Unit Chemistry
b) b molar parts of a structural unit S2 of formula II

OG Complex Work Unit Chemistry
c) c molar parts of a structural unit S3 of formula III

OG Complex Work Unit Chemistry
and d) d molar parts of a structural unit S4 of formula IV

OG Complex Work Unit Chemistry
wherein
each M independently from each other represents H+, an alkali metal ion, an alkaline earth metal ion, a di- or trivalent metal ion, an ammonium ion or an organic ammonium group,
each Ru independently from each other represents hydrogen or a methyl group,
each Rv independently from each other represents hydrogen or COOM,
m is 0, 1, 2 or 3,
p is 0 or 1,
each R1 and each R2 independently from each other represents
C1- to C20-alkyl,
-cycloalkyl,
-alkylaryl or
for -[AO]n—R4, where
A represents a C2- to C4-alkylene,
R4 represents H, C1- to C20-alkyl, -cyclohexyl or -alkylaryl, and
n is an integer in the range of from 2-350,
each R3 independently of the others represents NH2, —NR5R6, —OR7NR8R9,
wherein R5 and R6 independently from each other stand for
C1- to C20-alkyl, -cycloalkyl
alkylaryl or -aryl,
or for a hydroxyalkyl- or acetoxyethyl-(CH3—CO—O—CH2—CH2—) or
hydroxyisopropyl-(HO—CH(CH3)—CH2—) or acetoxyisopropyl group (CH3—CO—O—CH(CH3)—CH2—);
or R5 and R6 together form a ring of which the nitrogen is part, to form a morpholine or imidazoline ring,
R7 is a C2-C4-alkylene group,
each R8 and R9 independently from each other represent C1- to C20-alkyl,
-cycloalkyl, -alkylaryl,
-aryl or a hydroxyalkyl group,
and a, b, c and d stand for the molar parts of the structural units S1, S2, S3 and S4, with a/b/c/d having values in the following ranges: (0.1-0.9)/(0.1-0.9)/(0-0.8)/(0-0.8), with the provision that a+b+c+d is equal to 1,
ii) adding a base to adjust the pH of the aqueous copolymer solution to at least 10,
iii) adding 0.01 to 5 w %, based on the weight of the aqueous copolymer solution, of at least one additive selected from anti-caking agents and/or anti-oxidants,
iv) spray-drying the aqueous copolymer solution to obtain a powder, and
v) optionally sieving.