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US 4,546,160 AGranted
Bulk polymerization process for preparing high solids and uniform copolymers
AssigneeS. C. Johnson & Son, Inc.
InventorsJulia A. Brand, Lee W. Morgan
Life of this patent
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Abstract
A process to continuously bulk polymerize acrylic monomers to prepare low molecular weight, uniform, polymers employs minor amounts of initiator and, optionally solvents, at short residence times and moderate reaction temperatures to provide high yields of a product suitable for high solids applications.
Claims13
A continuous bulk polymerization process for preparing enhanced yields of high solids, non-styrenic acrylic polymer product having a number average molecular weight of about 1000 to 2500 a polydispersity ratio of less than about 3;
- a dispersion index of up to about 5 and a low chromophore content comprising the steps of continuously:
- (a) charging into a continuous mixed reactor zone containing a molten resin mixture consisting esentially of;
- (i) at least one acrylic monomer;
- (ii) a polymerization initiator in amounts to provide a molar ratio of said initiator to said acrylic monomer from about 0.0005:1 to 0.06:1,
- (iii) from about 0 to 25 percent based on the weight of acrylic monomers of a reaction solvent, wherein said molten resin mixture comprises unreacted acrylic monomers and the acrylic polymer product;
- (b) maintaining a flow rate through said reaction zone sufficient to:
- (i) provide a residence time of said charged acrylic monomer in said reaction zone of from about 1-30 minutes;
- and
- (ii) maintain a predetermined level of reaction mixture in said reaction zone, and;
- (c) maintaining the molten resin mixture at an elevated temperature with the range of from about 180.degree. C. to 270.degree. C. sufficient to provide accelerated conversation to a readily processable, uniform, concentrated polymer product.
7 more elements
Dependencies are inferred from the claim text.