Colorant compatible synthetic thickener for paint
View Patent ↗A synthetic polymer has a water-soluble or water-swellable polymer backbone and terminal groups and/or intermediate groups of blocks of hydrophobes of alkyl- or aryl compounds containing a polymerizable cyclic monomer or a polymerizable double bond (or alkene) group or derivatives thereof. The blocks of hydrophobes are composed of two or more units of the same or different hydrophobes. These synthetic polymers are used as rheology modifiers, especially in latex paints.
1. A polymer composition comprising a water soluble or water swellable synthetic polymer backbone hydrophobically modified with oligomeric hydrophobes having covalently connected ends and/or intermediate blocks of oligomeric hydrophobes that have the following formula:
where:
a) n is an integer from 1-100
b) R is CH 2 OC 8 H 17 ,
c) A is the connecting diradical —O—CH 2 —,
d) B is the connecting group —O—CH 2 —,
e) C is a connecting end same as A or a terminating end equal to: —OH,
wherein the water soluble or water swellable synthetic polymer backbone is polyacetalpolyether.
2. The composition of claim 1 , wherein n has a lower limit of 3.
3. The composition of claim 1 , wherein n has a lower limit of 7.
4. The composition of claim 1 , wherein n has a lower limit of 10.
5. The composition of claim 1 , wherein n has an upper limit of 75.
6. The composition of claim 1 , wherein n has an upper limit of 50.
7. The composition of claim 1 , wherein n has an upper limit of 20.
8. A process for preparing the water soluble or water swellable polymer composition comprising
a) reacting a water soluble or water swellable backbone with a catalyzing agent in order to activate the polymer backbone and produce a reaction mass,
b) adding an oligomerizing hydrophobic monomer(s) to the reaction mass, and
c) polymerizing the reaction mass at sufficient temperature and for a sufficient time in order to add the oligomerizing hydrophobic monomer(s) to the backbone as end groups and/or intermediate groups to obtain the water soluble or water swellable polymer composition, wherein the backbone is polyacetalpolyether and wherein the water soluble or water swellable polymer composition has covalently connected ends and/or intermediate blocks of oligomeric hydrophobes that have the following formula:
where:
i) n is an integer from 1-100
ii) R is CH 2 OC 8 H 17 ,
iii) A is the connecting diradical —O—CH 2 —,
iv) B is the connecting group —OCH 2 —, and
v) C is a connecting end same as A or a terminating end equal to; —OH.
9. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with an upper limit of about 10,000,000.
10. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with an upper limit of about 1,000,000.
11. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with an upper limit of about 100,000.
12. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with a lower limit of about 400.
13. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with a lower limit of about 1000.
14. The process of claim 8 , wherein the polymer prepared by the process has a weight average molecular weight with a lower limit of about 4000.
15. The process of claim 8 , wherein the polymer prepared by the process has intermediate blocks of oligomeric hydrophobes that are pendant of the backbone.
16. The process of claim 8 , wherein the polymer prepared by the process has intermediate blocks of oligomeric hydrophobes that are internal in the backbone.
17. An aqueous protective coating composition comprising (a) the composition of claim 1 , (b) a colorant, and (c) a film forming latex, wherein the viscosity of the coating composition remains unchanged or has an insignificant loss as compared to when using conventional rheology modifiers upon adding a colorant.
18. The aqueous protective coating composition of claim 17 , wherein the composition is a latex paint.
19. The aqueous protective coating composition of claim 17 , wherein the latex is selected from the group consisting of acrylics, vinyl acrylics, and styrene.
20. The aqueous protective coating composition of claim 19 , wherein the latex paint has a pigment volume concentration of from about 15 to about 80.
21. An aqueous protective coating composition comprising a) the polymer composition of claim 1 , b) at least one thickener selected from the group consisting of hydrophobically modified ethylene oxide urethane block copolymers, hydrophobically modified alkaline soluble emulsions, cellulose derivative, and polyacetalpolyether, c) a colorant, and d) a film forming latex.
22. The aqueous protective coating composition of claim 21 , wherein the cellulose derivative is present and is selected from the group consisting of hydroxyethylcellulose (HEC), hydroxypropyl cellulose (HPC), methylcellulose (MC), carboxymethylcellulose (CMC), methylhydroxy ethylcellulose (MHEC), ethylhydroxyethylcellulose (EHEC), and hydrophobically modified hydroxyethylcellulose (HMHEC).