Poly(methyl methacrylate) resin composition

Patent metadata

Field	Value
Publication number	US-11136452-B2
Application number	US-201816631409-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Jul 21, 2017
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Provided are poly(methyl methacrylate) resin compositions containing (a) a methyl methacrylate polymer, and (b) a multistage acrylic impact modifier containing (i) a core-shell polymer, and (ii) an overpolymer containing methyl methacrylate monomers and a chain transfer agent.

First claim

What is claimed is:

1. A poly(methyl methacrylate) resin composition comprising:
(a) 30 to 90 weight % of a methyl methacrylate polymer, based on the total weight of the poly(methyl methacrylate) resin composition, comprising polymerized structural units of
(i) 50 to 100 weight % methyl methacrylate monomer, based on the total weight of the methyl methacrylate polymer, and
(ii) 0 to 50 weight % of a copolymerizable monomer, based on the total weight of the methyl methacrylate polymer;

(b) 10 to 70 weight % of a multistage acrylic impact modifier, based on the total weight of the poly(methyl methacrylate) resin, comprising
(i) 50 to 99 weight % of a core-shell polymer, based on the total weight of the multistage acrylic impact modifier, comprising
(A) 50 to 99.9 weight % of a core polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 98.2 to 99.8 weight % of C 1 -C 12 alkyl acrylate monomers, and (2) 0.2 to 1.8 weight % of a cross-linker, based on the total weight of the core polymer, and
(B) 0.1 to 50 weight % of a shell polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 50 to 100 weight % methyl methacrylate monomers, and (2) 0 to 50 weight % of a copolymerizable monomer, based on the total weight of the shell polymer, and

(ii) 1 to 50 weight % of an overpolymer, based on the total weight of the multistage acrylic impact modifier, comprising polymerized structural units of
(A) 50 to 99.95 weight % methyl methacrylate monomers, based on the total weight of the overpolymer,
(B) 0.05 to 2 weight % of a chain transfer agent, based on the total weight of the overpolymer, and
(C) 0 to 49.95 weight % of a copolymerizable monomer.

2. The resin composition of claim 1 , wherein the C 1 -C 12 alkyl acrylate monomers of the core polymer of the multistage acrylic impact modifier comprise at least one of methyl acrylate, ethyl acrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, lauryl methacrylate, phenyl acrylate, phenoxy-ethyl acrylate, hydroxyethyl acrylate, and acrylonitrile.

3. The resin composition of claim 2 , wherein the C 1 -C 12 alkyl acrylate monomers of the core polymer of the multistage acrylic impact modifier are selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, and combinations thereof.

4. The resin composition of claim 1 , wherein the copolymerizable monomer of the overpolymer comprises butyl acrylate.

5. The resin composition of claim 1 , wherein the chain transfer agents of the overpolymer of the multistage acrylic impact modifier comprise at least one of butyl 3-mercaptopropionate, n-dodecyl mercaptan, 1,8-dimercapto-3,6-dioxaoctane, t-nonyl mercaptan, n-octyl mercaptan, t-dodecyl mercaptan, isooctyl 3-mercaptopropionate, pentaphenylethane, 4-methylbenzenethiol, 4,4′-thio-bis-benzenethiol, mercaptoethanol, 3-mercaptopropionic acid, and glycerol mercaptan.

6. The resin composition of claim 2 , wherein the chain transfer agent comprises at least one of butyl 3-mercaptopropionate and dodecyl mercaptan.

7. The resin composition of claim 1 , wherein the overpolymer has a weight average molecular weight of from 1,000 to 300.00 g/mol.

8. The resin composition of claim 1 , wherein the multistage acrylic impact modifier has a particle size of from 150 to 250 nm.

9. An article of manufacture comprising a poly(methyl methacrylate) resin composition comprising:
(a) 30 to 90 weight % of a methyl methacrylate polymer, based on the total weight of the poly(methyl methacrylate) resin, comprising polymerized structural units of
(i) 50 to 100 weight % methyl methacrylate monomers, based on the total weight of the methyl methacrylate polymer, and
(ii) 0 to 50 weight % of a copolymerizable monomer, based on the total weight of the methyl methacrylate polymer;

(b) 10 to 70 weight % of a multistage acrylic impact modifier, based on the total weight of the poly(methyl methacrylate) resin, comprising
(i) 50 to 99 weight % of a core-shell polymer, based on the total weight of the multistage acrylic impact modifier, comprising
(A) 50 to 99.9 weight % of a core polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 98.4 to 99.8 weight % of C 1 -C 12 alkyl acrylate monomers, and (2) 0.2 to 1.8 weight % of a cross-linker, based on the total weight of the core polymer, and
(B) 0.1 to 50 weight % of a shell polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 50 to 100 weight % methyl methacrylate monomers, and (2) 0 to 50 weight % of a copolymerizable monomer, based on the total weight of the shell polymer, and

(ii) 1 to 50 weight % of an overpolymer, based on the total weight of the multistage acrylic impact modifier, comprising polymerized structural units of
(A) 50 to 99.95 weight % methyl methacrylate monomer, based on the total weight of the overpolymer,
(B) 0.05 to 2 weight % of a chain transfer agent, based on the total weight of the overpolymer, and
(C) 0 to 49.95 weight % of a copolymerizable monomer.

10. A poly(methyl methacrylate) resin composition comprising:
(a) 50 to 70 weight % of a methyl methacrylate polymer, based on the total weight of the poly(methyl methacrylate) resin, comprising polymerized structural units of
(i) 90 to 99 weight % methyl methacrylate monomers, based on the total weight of the methyl methacrylate polymer, and
(ii) 1 to 10 weight % of a copolymerizable monomer, based on the total weight of the methyl methacrylate polymer;

(b) 30 to 50 weight % of a multistage acrylic impact modifier, based on the total weight of the poly(methyl methacrylate) resin, comprising
(i) 65 to 95 weight % of a core-shell polymer, based on the total weight of the multistage acrylic impact modifier, comprising
(A) 90 to 98 weight % of a core polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 99 to 99.6 weight % of C 1 -C 12 alkyl acrylate monomers selected from the group consisting of butyl acrylate, 2-ethylhexyl acrylate, and combinations thereof, and (2) 0.4 to 1.0 weight % of allyl methacrylate, based on the total weight of the core polymer, and
(B) 2 to 10 weight % of a shell polymer, based on the total weight of the core-shell polymer, comprising polymerized structural units of (1) 95 to 100 weight % methyl methacrylate monomers, and (2) 0 to 5 weight % of a copolymerizable monomer, based on the total weight of the shell polymer, and

(ii) 5 to 35 weight % of an overpolymer, based on the total weight of the multistage acrylic impact modifier, comprising polymerized structural units of
(A) 84.5 to 97.5 weight % methyl methacrylate monomers, based on the total weight of the overpolymer,
(B) 0.5 to 1.5 weight % of a chain transfer agent selected from the group consisting of butyl 3-mercaptopropionate, dodecyl mercaptan, and combinations thereof, based on the total weight of the overpolymer, and
(C) 1 to 15 weight % butyl acrylate monomers, based on the total weight of the overpolymer.

Assignees

• Rohm & Haas

Inventors

• Brown Steven
• Cruz Carlos A
• Wills Morris

Classifications

• C08L2207/53

  Core-shell polymer · CPC title

• C08F285/00

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title

• C08L51/04

  grafted on to rubbers · CPC title

• C08L33/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08F2/38

  Polymerisation using regulators, e.g. chain terminating agents {, e.g. telomerisation} · CPC title