Process to make a composition comprising a monovinylaromatic polymer and a polymer made from renewable resources
A process to make a composition that includes a monovinylaromatic polymer and a dispersed phase of polymer made from renewable resources may include forming a polymerizable mixture. The polymerizable mixture may include a monomer or dimer dispersed in a monovinylaromatic monomer, and optionally a rubber dissolved in the monovinylaromatic monomer. The process may include contacting a catalyst with the polymerizable solution at conditions effective to produce a polymer dispersed in the monovinylaromatic monomer. The process may include polymerizing through a radical pathway the solution, optionally in the presence of a free radical initiator and a chain transfer agent, to obtain a monovinylaromatic polymer that includes a dispersed phase. The process may include degassing to separate unpolymerized monomers and comonomers, and recovering a composition of monovinylaromatic polymer.
1. A process to make a composition comprising at least a monovinylaromatic polymer and at least a dispersed phase of one or more polymers made from renewable resources comprising:
a) forming a polymerizable mixture comprising:
at least a monomer or a dimer (a1) selected among a hydroxy carboxylic acid, a precursor of said hydroxy carboxylic acid, and a cyclic component polymerizable by ring-opening polymerization (ROP),
wherein the monomer or the dimer (a1) is dispersed in at least (a2) one monovinylaromatic monomer,
b) contacting a catalyst with the polymerizable mixture at conditions effective to produce a polymer A1 comprising the repeating units (a1) dispersed in the (a2) monovinylaromatic monomer,
c) polymerizing through a radical pathway the solution obtained at step b) in the presence of a free radical initiator and in the presence of chain transfer agents, to obtain a monovinylaromatic polymer A2 comprising a dispersed phase of the polymer A1,
d) degassing the product of step c) to separate unpolymerized monomers and comonomers and recovering a composition comprising at least the (A2) monovinylaromatic polymer and at least (A1) wherein, the weight proportion A1/(A2+A1) is up to 50%.
2. The process according to claim 1 , wherein the polymerization of (a1) at step b) thereof is made below 100° C.
3. The process according to claim 2 , wherein the polymerization of (a1) at step b) is made below 60° C.
4. The process according to claim 3 , wherein the polymerization of (a1) at step b) is made at 20-40° C.
5. The process according to claim 1 , wherein the catalyst used at step b) comprises organo catalysts or metal catalysts.
6. The process according to claim 1 , wherein (a1) is a lactide.
7. The process according to claim 1 , wherein the weight proportion A1/(A2+A1) is up to 30%.
8. The process according to claim 7 , wherein the weight proportion A1/(A2+A1) is up to 20%.
9. The process according to claim 1 , wherein the polymerizable mixture further comprises a mixture of an epoxide and carbon dioxide.
10. The process according to claim 1 , wherein the polymerizable mixture further comprises a rubber dissolved in (a2) the monovinylaromatic monomer.