Processes for preparing non-gelling high polymer compositions and thermoplastic blends thereof
AssigneeRohm and Haas Company
InventorsCarlos Alfonso Cruz, Eugene Patrick Dougherty, Harry Richards Herman III, Robert Julian Smith, Morris Christopher Wills, Robert Victor Slone
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Abstract
Disclosed are compositions and processes for preparing polymeric materials having polymerizable units derived from at least one C8 to C30 alkyl (meth)acrylate monomer, and at least one chain branching unit. The presence of the chain branching unit suprisingly results in the polymeric composition having non-gelled polymer chains. The polymeric compositions are useful as additives for improving the melt strength of thermoplastic resins.
Claims10
A process for preparing an aqueous dispersion of polymer particles, said process comprising the steps of:
- a) preparing an aqueous emulsion of hydrophobic monomer droplets, said droplets comprising:
- i) at least one C8 to C30 alkyl (meth)acrylate monomer,
- ii) at least one chain branching monomer, said chain branching monomer present in an amount not greater than 0.10 weight percent based on total weight of the C8 to C30 alkyl (meth)acrylate monomer, and
- iii) at least one emulsifier;
- and
- b) polymerizing said C8 to C30 alkyl (meth)acrylate monomer with said chain branching monomer using at least one free radical initiator, wherein said chain branching monomer results in the polymer particles comprising non-gelled polymer chains, and wherein said non-gelled polymer chains have a weight average molecular weight of at least 100,000 g/mol.
Dependencies are inferred from the claim text.