Polyolefin/(meth)acrylic impact modifier and method of preparing same

Patent metadata

Field	Value
Publication number	US-2016168368-A1
Application number	US-201414902580-A
Country	US
Kind code	A1
Filing date	Jun 30, 2014
Priority date	Jul 2, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A composite polymer composition comprising: the emulsion polymerization product of: (i) an aqueous polyolefin dispersion comprising the melt kneading product of one or more polyolefins, from 2 to 25 wt % of one or more dispersion stabilizing agents and water, and (ii) one or more (meth)acrylic monomers; wherein the one or more polyolefins have a Tg equal to or less than 50° C.; and wherein the melt kneading product (i) comprises polymer particles having a volume average particle size between 150 nm and 2000 nm dispersed in the water; and wherein the one or more (meth)acrylic monomers polymerize onto the polymer particles form composite polymer particles is provided. Also provided is a method of making the composition and impact modifiers comprising the composition.

First claim

1 . A composite polymer composition comprising:
an emulsion polymerization product of:
(i) an aqueous polyolefin dispersion comprising the melt kneading product of one or more polyolefins, from 2 to 25 wt % of one or more dispersion stabilizing agents, water and optionally a neutralizing agent, and
(ii) one or more (meth)acrylic monomers;
wherein the one or more polyolefins have a Tg equal to or less than 50° C.; and wherein the melt kneading product (i) comprises polymer particles having a volume average particle size between 150 nm and 2000 nm dispersed in the water; and wherein the one or more (meth)acrylic monomers polymerize onto the polymer particles to form composite polymer particles.

2 . The composite polymer composition according to claim 1 , wherein the ratio of the-one or more polyolefins to the poly(meth)acrylic in the composite polymer particles is between 60:40 and 95:5.

3 . The composite polymer composition according to claim 1 , wherein the one or more polyolefins are selected from the group consisting of ethylene homopolymers, ethylene/α-olefin copolymers, ethylene/α-olefin multiblock interpolymers, propylene, homopolymers, propylene/α-olefin copolymers and propylene/α-olefin multiblock interpolymers.

4 . The composite polymer composition according to claim 1 , wherein the one or more (meth)acrylic monomers are selected from the group consisting of functionalized (meth)acrylic monomers.

5 . The composite polymer composition according to claim 1 , wherein the composite polymer particles have a core/shell or core/partial shell structure.

6 . The composite polymer composition according to claim 1 , wherein the (meth)acrylic shell is partially crosslinked and has a Tg less than 50° C.

7 . An impact modifier composition comprising
a spray dried product of the composite polymer composition according to claim 1 .

8 . An impact modified resin comprising:
a matrix polymer resin; and the impact modifier composition according to claim 7 .

9 . The impact modified resin according to claim 8 , wherein the matrix polymer resin is selected from the group consisting of polycarbonate (PC) and PC blends, polyesters, polystyrene (PS), styrenic copolymers, polyvinylchloride (PVC), polyamides (PA) and acetal resins.

10 . A method for forming an impact modifier composition comprising:
melt kneading one or more polyolefins, less than or equal to one or more dispersion stabilizing agents, water and optionally a neutralizing agent to form a melt kneading product, wherein the one or more polyolefins have a Tg of equal to or less than 50° C.; adding to the melt kneading product one or more (meth)acrylic monomers under emulsion polymerization conditions to form a composite polymer composition; and isolating the composite polymer particles by removing water from the emulsion, wherein the isolating is selected from the group consisting of spray drying and fluid bed drying.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Chen Liang
• Saint-Gerard Yannick
• Nelliappan Veera
• Abdul-Rahiman Vithya A

Classifications

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• C08L69/00

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L2207/53

  Core-shell polymer · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title