Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1980-10-29
1983-12-06
Levin, Stanford M.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
106128, 106168, 106169, 106195, 106203, 106205, 106208, 106213, 252 85A, 264185, 264186, 264187, 264218, 424343, 426105, 427339, 427385, 428439, 524 27, 524 35, 524 51, 524 55, 525 57, D01F 1102, D01F 1104, C08L 116, C08L 500
Patent
active
044193165
ABSTRACT:
A process of preparing film, fibers and other shaped articles by nitrosating a polyhydroxy polymer in a reaction medium containing a solubilizing agent for the resulting polyhydroxy polymer nitrite ester and a suitable proton acceptor, bringing the reaction mixture into the desired shape and regenerating and separating the polyhydroxy polymer by contact with a protic solvent in the presence of an acid catalyst. The polyhydroxy polymer may be a polyvinyl alcohol, cellulose or other polysaccharide, and mixtures thereof. Also dissolved in the reaction medium may be an organic solvent soluble polymer substantially lacking hydroxyl groups. If mixtures of polyhydroxy polymers or of polyhydroxy polymers lacking hydroxyl groups and organic solvent soluble polymers are employed the resulting films, fibers or other shaped articles consist of homogeneous and intimate mixtures of all the polymers originally present in solution. Solutions containing polyhydroxy polymer nitrite ester or a mixture of polyhydroxy polymer nitrite ester and organic solvent soluble polymer lacking hydroxyl groups in an anhydrous medium containing a highly polar aprotic solvent or a weak tertiary amine base or both are disclosed.
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J.A.C.S., 69, pp. 1636-1640 (1947).
156th ACS Nat. Meeting, Div. of Cellulose, Wood and Fiber Chem., Abstracts, No. 15 (1968).
CA, 68, 41234b (1968).
Chem. and Ind. p. 296 (3-1969).
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