Liquid composition comprising a multistage polymer, its method of preparation and its use
The present invention relates to a liquid composition comprising a monomer, a (meth)acrylic polymer and a multistage polymer. In particular the present invention it relates to liquid composition comprising a monomer, a (meth)acrylic polymer and a multistage polymer that can be used as a syrup. More particularly the present invention relates also to a process for preparing a liquid composition comprising a monomer, a (meth)acrylic polymer and a multistage polymer.
1. A process for manufacturing a liquid composition comprising the steps of:
a) preparing a composition comprising a (meth) acrylic polymer (P1) having a mass average molecular weight Mw of less than 100,000 g/mol and a multi stage polymer, said multistage polymer being 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) being made in the first stage of a multistage process and forming the core for the polymer particle having the multilayer structure, and
b) mixing the composition of previous step with a monomer (M1),
wherein the multistage polymer to monomer (M1) ratio in the liquid composition is between 1/99 and 25/75, such that the multistage polymer is homogenously dispersed in said liquid composition.
2. The 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 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 process according to claim 1 wherein that (meth) acrylic polymer (P1) is not crosslinked or not grafted on any other polymer or polymers.
5. The process according to claim 1 wherein (meth) acrylic polymer (P1) is polymerized apart and mixed or blended with the multistage polymer.