Stabilized PVC products and their production

Details Stabilized PVC products and their production Stabilized PVC products and their production

1991-09-19

1993-05-11

Page, Thurman K.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

424487, 523122, A01N 2500, A61K 914, C08J 324

Patent

active

052099318

ABSTRACT:
Crosslinked plasticized or unplasticized PVC products having gradient crosslinking density, with a high crosslinking density on the outer surface and a low or none crosslinking density at the bulk of the product, are prepared by immersing the PVC product in a hot water solution of a crosslinking material and a phase transfer catalyst. The products obtained provide controlled release of substances occluded within the PVC matrix, thus preventing leakage of plasticizers, stabilizers and other additives, and permitting controlled slow release of substances like pesticides, fertilizers, drugs and the like, into the surrounding environment.

REFERENCES:
patent: 2438097 (1948-03-01), Rogers et al.
patent: 2466998 (1949-04-01), Rogers et al.
patent: 3808173 (1974-04-01), Orihashi
patent: 4405360 (1983-09-01), Cardarelli
patent: 4806393 (1989-02-01), Levin
Mori, Kunio et al. Modification of Poly(vinyl chloride), J. Polymer Science: Part A-1, #3, vol. 9, 639-650 (1971).

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