Sulphur products for adding a polythiol on a norbornene derivative, preparation method and use for obtaining radical cross-linking products
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United States of America Patent
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Sep 10, 2002
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N/A
app pub date -
Sep 29, 2000
filing date -
Apr 3, 1998
priority date (Note) -
Expired
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Abstract
Sulphur product, (P), process for making (P), films, molded articles made therefrom, wherein (P) is obtained by the addition reaction of at least one polythiol (I) with at least one compound of formula (II): ##STR1## in which R.sup.1 represents a linear or branched aliphatic residue comprising an ethylenic unsaturation double bond, it being optional for the latter to be that by which R.sup.1 is connected to the norbornene ring, it also being optional for the said ring to comprise other substituents chosen from C.sub.1 -C.sub.3 alkyl groups, in proportions corresponding or substantially corresponding to one thiol group of the polythiol or polythiols (I) per mole of the compound or compounds (II), the thiol groups of the compound or compounds (I) adding predominantly to the cyclic double bond of the compound or compounds (II) and, on average, one ethylenic unsaturation of a compound (II) of the two which it carries remaining free; or sulphur product, (P'), obtained by the addition reaction of at least one polythiol (I) with at least one sulphur product (P), the double bonds of the said sulphur product (P) having been completely or substantially completely consumed, the sulphur product (P') obtained being a crosslinked product.
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