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US 9,957,385 B2Granted
Plasticizer-free article made of PVC graft copolymers
AssigneeVESTOLIT GmbH & Co. KG
InventorsDavide Brizzolara, Ingo Fischer, Jan-Stephan Gehrke, Dieter Polte, Axel Stieneker, Harald Sturm
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Abstract
The invention relates to blends of vinyl chloride graft copolymers as well as to a method for preparing such vinyl chloride graft copolymers and their blends. The invention also relates to molded articles manufactured by using the blends according to the invention.
Claims20
A polymer blend, comprising:
- a first vinyl chloride graft copolymer prepared using emulsion polymerization and including a graft base having a first glass transition temperature and a grafted copolymer phase including vinyl chloride and having a second glass transition temperature, the first vinyl chloride graft copolymer having a first percentage weight distribution of graft base and grafted copolymer phase;
- and
- a second vinyl chloride graft copolymer prepared using emulsion polymerization and including the graft base and the grafted copolymer phase, the second vinyl chloride graft copolymer having a second percentage weight distribution of graft base and grafted copolymer phase which is different than the first percentage weight distribution,
- wherein the first and second vinyl chloride graft copolymers have an average particle size below 300 nm.
1 more element
A method of forming a polymer blend, the method comprising:
- forming a first vinyl chloride graft copolymer solid having an average particle size below 300 nm by
- polymerizing a graft base having a first glass transition temperature;
- and
- grafting a copolymer phase including vinyl chloride and having a second glass transition temperature onto the graft base using emulsion polymerization;
- forming a second vinyl chloride graft copolymer solid having an average particle size below 300 nm by polymerizing the graft base;
- and
- grafting the copolymer phase onto the graft base using emulsion polymerization;
- and
- mixing the first and second vinyl chloride graft copolymer solids to form the polymer blend, wherein the first and second vinyl chloride graft copolymer solids differ from each other by their percentage weight distribution of grafted copolymer phase and graft base.
6 more elements
Dependencies are inferred from the claim text.