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US 4,035,322 AGranted
Method of preparing curable pellets of polyethylene
AssigneeSouthwire Company
InventorsStanley L. Tate, Bobby A. Rowland, Herbert M. Jacobs
Life of this patent
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Abstract
The present invention relates to a method for preparing curable pellets of polyethylene and copolymers thereof for subsequent use in an extrusion coating process by mixing polyethylene pellets with a liquid curing agent at a temperature below the decomposition temperature of the curing agent and below the softening point of polyethylene and copolymers thereof.
Claims8
A method of preparing curable pellets of polyethylene and copolymers of polyethylene comprising the steps of:
- (a) fusing polymers such as polyethylene and copolymers thereof with fillers, lubricants and antitoxidants in a plasticating means until said fillers, lubricants and antioxidants are evenly dispersed throughout the polymers;
- (b) processing the final polymer, filler, lubricant, antioxidant mixture into pellets;
- (c) drying said pellets;
- (d) contacting and mixing said pellets with a stochiometric amount of a curing agent in an air fluid bed at a temperature below the softening point of said pellets and below the decomposition temperature of said curing agent with a continuous flow of turbulent air whereby said curing agent is coated upon and absorbed into said pellets.
1 more element
Dependencies are inferred from the claim text.