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US 6,190,581 B1Granted
Dehydrated antimonate/polymer pelletizing process
AssigneeLaurel Industries, Inc.
InventorsRobert J. Duffin, Jr., Irving Touval
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AssigneeLaurel Industries, Inc.
InventorsRobert J. Duffin, Jr., Irving Touval
Estimating the term…
A dehydrated mixture of hydrated sodium antimonate and ionomer polymer flame retard a polymer or resin composition such as film, fiber, electrical connection and molded part. From 10 to 90 parts sodium antimonate containing 3% moisture mixed with 10 to 90 parts ionomer polymer or polyethylene or ethylene vinyl acetate are added to a single screw vented extruder to produce pellet concentrate with a 0.1% moisture content for flame proofing PET. A composition may be prepared in a single or twin screw extruder or in a high shear blender in the presence of glass fiber by adding a dehydrated mixture of an alkyl tertabromophtalate and sodium antimonate and brominated polystyrene to polyethylene terephthalate or polybutylene terephthalate. A preferred temperature range for dehydration of hydrated sodium antimonate in the presence of a polymer is between 150° C. and 250° C.
A process for producing a flame proofing or flame retarding concentrate suitable for addition to a polymer or resin composition comprising the steps of dehydrating a mixture of hydrated sodium antimonate having a water content of about 2.9 weight percent, and at least one polymer in a vented or vacuum apparatus or high shear blender at a temperature above 200° C. and below 500° C. to produce the flame proofing or flame retarding concentrate which has a water content of below 0.2 weight percent.
A process for producing a flame proofing or fire retardant pellet comprising the steps:
A process for flame retarding a polymer or resin composition to produce a flame-retarded composition with the steps:
A process for flame proofing a glass-filled polyethylene terephthalate or polybutylene terephthalate composition with the steps:
Dependencies are inferred from the claim text.