POROUS POLYMER POWDER, ITS COMPOSITION, ITS USE AND COMPOSITION COMPRISING IT

1 . A polymeric composition in form of a porous polymer powder POW 1 having a total intruded volume of at least 1.2 ml/g as measured by mercury porosimetry.

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

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

4 . The polymeric composition according to claim 1 , wherein the total intruded volume is between 1.2 ml/g and 10 ml/g.

5 . The polymeric composition according to claim 1 having an relative incremental intrusion for a pore size above 10 μm of at most 85%.

6 . The polymeric composition according to claim 1 having an incremental intrusion between a pore size from 10 μm to 1 μm of at least 0.1 ml/g.

7 . The polymeric composition according to claim 1 having an incremental intrusion between a pore size from 10 μm to 0.1 μm of at least 0.15 ml/g.

8 . The polymeric composition according to claim 1 having a relative incremental intrusion between a pore size from 10 μm to 1 μm of at least 5%.

9 . The polymeric composition according to claim 1 wherein the porous polymer powder POW 1 has a volume median particle size D50 between 1 μm and 700 μm.

10 . The polymeric composition according to claim 1 wherein an apparent bulk density of the polymer powder POW 1 is between 0.1 g/cm 3 and 0.60 g/cm 3 .

11 . The polymeric composition according to claim 1 wherein the polymer powder POW 1 comprises polymeric particles PAR 1 that make up at least 50 wt % of the polymer powder POW 1 .

12 . The polymeric composition according to claim 11 , wherein the polymeric particles PAR 1 have a weight average particle size (diameter) between 15 nm and 900 nm.

13 . The polymeric composition according to claim 1 wherein the polymeric particle PAR 1 is a multistage polymer MSP 1 in a form of core-shell particles.

14 . The polymeric composition according to claim 11 wherein the polymer powder POW 1 comprises a multistage polymer MSP 1 in a form of a core-shell particle and a (meth)acrylic polymer MP 1 in a form of a polymeric particles.

15 . The polymeric composition according to claim 11 wherein the polymer powder POW 1 comprises a polymer P 1 .

16 . The polymeric composition according to claim 13 wherein the multistage polymer MSP 1 has a multilayer structure comprising at least one stage (SA 1 ) comprising a polymer (A 1 ) having a glass transition temperature below 10° C., and at least one stage (SA 2 ) comprising a polymer (A 2 ) having a glass transition temperature over 60° C.

17 . The polymeric composition according to claim 1 wherein the polymer powder POW 1 comprises a multistage polymer MSP 1 and a (meth)acrylic polymer MP 1 .

18 . A process for manufacturing a liquid polymer composition LCP 1 comprising the steps of:

a) providing the polymeric composition in form of a porous polymer powder POW 1 having a total intruded volume of at least 1.2 ml/g as measured by mercury porosimetry according to claim 1 , and

b) bringing into contact said polymeric composition in form of said porous polymer powder POW 1 with a liquid composition LC 1 .

19 . The process according to claim 18 , wherein a viscosity of the liquid composition LC 1 is between 0.5 mPas 1000 Pa*s at a temperature of 25° C.

20 . The process according to claim 18 wherein the liquid composition LC 1 is chosen from compositions for preparing vinyl esters, unsaturated polyesters or epoxy resins; styrenic monomers, (meth)arylic monomers, and mixtures thereof.

21 . The process according to claim 18 wherein the pourous polymer powder POW 1 represents between 0.5 and 50 wt % of the liquid polymer composition LCP 1 .

22 . (canceled)

23 . A process to reduce the dispersing time of a polymer powder in a liquid by providing a polymeric composition in form of a porous polymer powder POW 1 having total intruded volume of at least 1.2 ml/g as measured by mercury porosimetry according to claim 1 .

24 . The process according to claim 23 , comprising the steps of:

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

bringing into contact the polymeric composition in form of said porous polymer powder POW 1 and said precursor.

25 . The process according to claim 24 , wherein the precursor is liquid, having a viscosity of the liquid composition LC 1 between 0.5 mPas 1000 Pa*s at a temperature of 25° C.

26 . The process according to claim 24 , wherein between 0.5 parts by weight and 100 parts by weight of porous polymer powder POW 1 are brought into contact for 100 parts by weight of said precursor.

27 . (canceled)