Granted Patent B2

US 12,643,965 · App. 17/777,293 · Granted Jun 2, 2026

Inventors: Aline Couffin (Lacq, FR); Philippe Hajji (Pierre-Benite Cedex, FR); Alexandre Vermogen (Pierre-Benite Cedex, FR); Elisabeth Bay (Lacq, FR); Jean-Claude Saint-Martin (Lacq, FR); Vinciane Chartois (Pierre-Benite Cedex, FR)

Assignee: ARKEMA FRANCE

C08F36/06C08F2/22C08F20/06C08F2500/18C08F2500/24C08F2500/32

Abstract

Claims (46)

1 . A polymer composition (PC1) in a form of a polymer powder comprising:

a) one stage (A) comprising a polymer (A1) having a glass transition temperature of less than 10° C.,

b) one stage (B) comprising a polymer (B1) having a glass transition temperature of at least 60° C., and

c) a polymer (C1) having a glass transition temperature of at least 30° C., said polymer (C1) represents at most 40 wt % of the composition based on a), b) and c) only,

wherein at least the component a) and the component b) of polymer composition (PC1) are part of a multistage polymer (MP1),

wherein the polymer (C1) has a mass average molecular weight Mw between 10,000 g/mol and 500,000 g/mol and

wherein the polymer composition (PC1) in the form of a polymer powder has a total intruded volume of at least 1.2 ml/g and at most 10 ml/g as measured by mercury porosimetry and has a cumulative intrusion for a pore size above 10 μm of at least 0.9 ml/g and an incremental intrusion between a pore size from 1 μm to 0.1 μm is at least 0.05 ml/g.

2 . The polymeric composition according to claim 1 , wherein the total intruded volume is at least 1.35 ml/g and at most 10 ml/g as measured by mercury porosimetry.

3 . The polymeric composition (PC1) according to claim 1 wherein a relative incremental intrusion of the polymer powder for a pore size above 10 μm is at most 85%.

4 . The polymer composition (PC1) according to claim 1 wherein an incremental intrusion of the polymer powder between a pore size from 10 μm to 1 μm is at least 0.1 ml/g.

5 . The polymer composition (PC1) according to claim 1 wherein an incremental intrusion of the polymer powder between a pore size from 10 μm to 0.1 μm is at least 0.15 ml/g.

6 . The polymeric composition according to claim 1 wherein a relative incremental intrusion between a pore size from 10 μm to 1 μm is at least 5%.

7 . The polymer composition (PC1) according to claim 1 wherein the polymer powder has a volume median particle size D50 between 1 μm and 700 μm.

8 . The polymer composition (PC1) according to claim 1 wherein an apparent bulk density of the polymer powder is between 0.1 g/cm 3 and 0.60 g/cm 3 .

9 . The polymer composition according to claim 1 wherein the polymer composition (PC1) in form of a polymer powder comprising polymeric particles PAR that make up at least 50 wt % of the polymer composition (PC1) in form of a polymer powder composition.

10 . The polymer composition according to claim 9 wherein the polymeric particles PAR have a weight average particle size between 15 nm and 900 nm.

11 . The polymer composition according to claim 1 wherein the stage (A) is the first stage and stage (B) comprising polymer (B1) is grafted on stage (A) comprising polymer (A1).

12 . The polymer composition according to claim 1 wherein the polymers (B1) and (C1) are acrylic or (meth)acrylic polymers.

13 . The polymer composition according to claim 1 wherein the polymer (A1) comprises butadiene as monomer.

14 . The polymer composition according to claim 1 wherein the polymers (A1), (B1) and (C1) are acrylic or (meth)acrylic polymers.

15 . The polymer composition according to claim 14 wherein at least 80 wt % of the acrylic or methacrylic monomers of the polymers (A1), (B1) or (C1) are chosen from methyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, tert-butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and mixtures thereof.

16 . A process for manufacturing the polymer composition according to claim 1 comprising the steps of:

a) polymerizing by emulsion polymerization of a monomer or monomer mixture (Am) to obtain one layer in stage (A) comprising polymer (A1) having a glass transition temperature of less than 10° C.,

b) polymerizing by emulsion polymerization of a monomer or monomer mixture (Bm) to obtain layer in stage (B) comprising a polymer (B1) having a glass transition temperature of at least 60° C.

c) polymerizing by emulsion polymerization of a monomer or monomer mixture (Cm) to obtain a layer in stage (C) comprising a polymer (C1) having a glass transition temperature of at least 30° C., and

d) coagulating the layers obtained in steps a) to c).

17 . A process for manufacturing the polymer composition (PC1) according to claim 1 comprising the steps of:

a) polymerizing by emulsion polymerization of a monomer or monomer mixture (Am) to obtain one layer in stage (A) comprising polymer (A1) having a glass transition temperature of less than 10° C.,

b) polymerizing by emulsion polymerization of a monomer or monomer mixture (Bm) to obtain layer in stage (B) comprising a polymer (B1) having a glass transition temperature of at least 60° C., both together steps a) and b) giving a multistage polymer (MP1), and

c) blending multistage polymer (MP1) with a polymer (C1) having a glass transition temperature of at least 30° C.

18 . The process according to claim 16 wherein step a) is made before step b).

19 . The process according to claim 16 wherein the step b) is performed in presence of the polymer (A1) obtained in step a).

20 . The process according to claim 16 wherein steps a), b), c) and d) are performed in that order.

21 . The process according to claim 16 where a solid content before starting the coagulating is below 35 wt %.

22 . The process according to claim 16 wherein a solid content before starting the coagulating is below 32 wt %.

23 . The process according to claim 16 wherein in the step d) a solid content before starting the coagulating is between 5 wt % and 35 wt %.

24 . The process according to claim 16 wherein in the step d) a solid content before starting the coagulating is between 20 wt % and 35 wt %.

25 . The process according to claim 16 wherein in the step d) a solid content before starting the coagulating is between 5 wt % and 20 wt %.

26 . The process according to claim 16 wherein in the step d) a solid content before starting the coagulating is between 10 wt % and 25 wt %.

27 . The process according to claim 16 wherein in the step d) a solid content before starting the coagulating is between 15 wt % and 27 wt %.

28 . The process according to claim 16 wherein in the step d) coagulating is made with a salt or an inorganic acid.

29 . The process according to claim 16 wherein the process comprises additionally a drying step e).

30 . A process to reduce the dispersing time of a polymer powder in a liquid composition, the process comprising adding the polymeric composition (PC1) according to claim 1 to said liquid composition, and wherein the liquid composition comprises a precursor for a thermosetting polymer or a monomer of a thermoplastic polymer.

31 . The process according to claim 30 , wherein the process comprises the steps of:

providing a precursor for a thermosetting polymer or a monomer of a thermoplastic polymer, and

bringing into contact the polymeric composition (PC1) and said precursor.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (15)