Reactive carriers for polymer melt injection

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/1539 (2006.01) C08J 3/215 (2006.01) C08J 5/18 (2006.01) C08K 5/1545 (2006.01) C08L 67/02 (2006.01) C08L 77/02 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2554228

The present invention concerns a reactive carrier that forms no by-products during melt injection of polymer into articles such as sheets, films, fibers and containers. The reactive carrier is used to mix additives into the polymer resin. More particularly, the invention relates to the use of one or more cyclic anhydrides or substituted cyclic anhydrides as the reactive carrier. The polymer can be polyester or polyamide. Suitable cyclic anhydrides are those with a melt point of less than the polyester or polyamide, preferably less than about 160 ~C, and more preferably less than about 125 ~C. Most preferable are cyclic anhydrides with a melt point less than about 100 ~C and especially suitable are those that are liquid at room temperature (25 ~C). The cyclic anhydride may be selected from the group of succinic anhydride, substituted succinic anhydride, glutaric anhydride, substituted glutaric anhydride, phthalic anhydride, substituted phthalic anhydride, maleic anhydride, substituted maleic anhydride, or mixtures of two or more of these.

L'invention se rapporte à un support réactif qui ne forme pas de sous-produits au cours de l'injection par fusion de polymères dans des articles tels que des feuilles, des films, des fibres et des contenants. Ce support réactif permet de mélanger des additifs dans la résine polymérique. Plus précisément, cette invention concerne l'utilisation d'un ou plusieurs anhydrides cycliques ou anhydrides cycliques substitués en tant que support réactif. Le polymère peut être du polyester ou du polyamide. Des anhydrides cycliques convenables possèdent un point de fusion inférieur à celui du polyester ou polyamide, de préférence inférieur à 160 ·C environ, idéalement inférieur à 125 ·C environ. De préférence, il s'agit d'anhydrides cycliques possédant un point de fusion inférieur à 100 ·C environ, ceux qui sont liquides à température ambiante (25·C) étant particulièrement utiles. L'anhydride cyclique peut être choisi dans le groupe anhydride succinique, anhydride succinique substitué, anhydride glutarique, anhydride glutarique substitué, anhydride phthalique, anhydride phthalique substitué, anhydride maléique, anhydride maléique substitué, ou des mélanges d'au moins deux de ces éléments.

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