Liquid (meth)acrylic composition comprising a multistage polymer and a (meth)acrylic monomer, its method of preparation and its use

Patent metadata

Field	Value
Publication number	US-11384236-B2
Application number	US-202017078144-A
Country	US
Kind code	B2
Filing date	Oct 23, 2020
Priority date	Jan 11, 2016
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

The present invention relates to a liquid (meth)acrylic composition comprising a (meth)acrylic monomer, a (meth)acrylic polymer and a multistage polymer.In particular the present invention it relates to liquid composition comprising a (meth)acrylic monomer, a (meth)acrylic polymer and a multistage polymer that can be used as a syrup and especially as a syrup for impregnation.

First claim

What is claimed is:

1. An impregnation process for impregnating a fibrous substrate, wherein said fibrous substrate comprises fibres having an aspect ratio of at least 1000 and said process comprises a step of impregnating said fibrous substrate with a liquid composition comprising:
a) a (meth)acrylic polymer (P1), having a mass average molecular weight Mw of less than 100,000 g/mol,
b) a multistage polymer in the form of core shell particles having a multilayer structure comprising at least one layer (A) comprising a polymer (A1) having a glass transition temperature below 0° C. and another layer (B) comprising a polymer (B1) having a glass transition temperature over 30° C., said layer (A) is made in the first stage of a multistage process forming the core for the polymer particle having the multilayer structure and
c) a (meth)acrylic monomer (M1) wherein the multistage polymer to monomer ratio by weight in the liquid composition is between 1/99 and 25/75.

2. The impregnation process according to claim 1 , wherein the (meth)acrylic polymer (P1) has a mass average molecular weight Mw between 5,000 g/mol and 70,000 g/mol.

3. The impregnation process according to claim 1 , wherein the (meth)acrylic polymer (P1) has a mass average molecular weight Mw between 6,000 g/mol and 50,000 g/mol.

4. The impregnation process according to claim 1 , wherein said multistage polymer is in form of core shell particles having a multilayer structure comprising at least one layer (A) comprising a polymer (A1) having a glass transition temperature below −5° C. and another layer (B) comprising a polymer (B1) having a glass transition temperature over 60° C., said layer (A) is made in the first stage of a multistage process forming the core for the polymer particle having the multilayer structure.

5. The impregnation process according to claim 1 , wherein the multistage polymer to monomer ratio by weight in the liquid composition is between 2/98 and 24/76.

6. The impregnation process according to claim 1 , wherein the (meth) acrylic polymer (P1) is soluble in the (meth)acrylic monomer (M1).

7. The impregnation process according to claim 1 , wherein the monomer (M1) is from the group consisting of acrylic acid, methacrylic acid, alkyl acrylic monomers, and alkyl methacrylic monomers and mixtures thereof, wherein the alkyl group has from 1 to 22 carbons that are either linear, branched or cyclic.

8. The impregnation process according to claim 1 , wherein the monomer (M1) is selected from the group consisting of methyl methacrylate, ethyl methacrylate, methyl acrylate, ethyl acrylate, methacrylic acid, acrylic acid, n-butyl acrylate, iso-butyl acrylate, n-butyl methacrylate, iso-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate and mixtures thereof.

9. The impregnation process according to claim 1 , wherein the layer (A) is the first layer and that layer (B) comprising polymer (B1) is grafted on layer (A) comprising polymer (A1).

10. The impregnation process according to claim 1 , wherein the polymers (A1) and (B1) are acrylic or methacrylic polymers.

11. The impregnation process according to claim 1 , wherein the polymer (A1) comprises at least 50 weight percent of polymeric units coming from isoprene or butadiene.

12. The impregnation process according to claim 1 , wherein the (meth) acrylic polymer (P1) comprises from 50wt % to 100wt % methyl methacrylate.

13. The impregnation process according to claim 1 , wherein the (meth) acrylic polymer (P1) comprises between 0wt % and 50wt % of a functional monomer.

14. The impregnation process according to claim 13 , wherein the functional monomer is selected from the group consisting of glycidyl (meth)acrylate, acrylic or methacrylic acid, amides derived from acrylic or methacrylic acids, dimethylacrylamide, 2-methoxyethyl acrylate or methacrylate, 2-aminoethyl acrylates or methacrylates that are optionally quaternized, acrylate or methacrylate monomers comprising a phosphonate or phosphate group, alkyl imidazolidinone (meth) acrylates, polyethylene glycol (meth) acrylates.

Assignees

• Arkema France

Inventors

• Inoubli Raber
• Hajji Philippe
• Pirri Rosangela
• Gerard Pierre

Classifications

• C08J5/04

  Reinforcing macromolecular compounds with loose or coherent fibrous material · CPC title

• C08F265/08 Primary

  on to polymers of nitriles · CPC title

• C08L33/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08F279/02

  on to polymers of conjugated dienes · CPC title

• C08L51/00

  Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (for ABS polymers C08L55/02); Compositions of derivatives of such polymers · CPC title