摘要:
Improved reinforced polyurethane/urea articles are made by reacting an organic polyisocyanate with low viscosity imino/enamine-functional compounds in contact with fiberous reinforcing agents.
摘要:
Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprise a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.
摘要:
An isocyanate-reactive composition having a plurality of isocyanate-reactive groups comprising:(i) at least one polyol having a number average molecular weight of from 2000 to 12,000;(ii) at least one low molecular weight polyol, including water, immiscible in said high molecular weight compound and having a molecular weight in the range of 18-500; and(iii) a compatibilizing amount of an amidine compound of the Formula (1) ##STR1## wherein each of R.sup.1 to R.sup.4 represent H or, independently or together, an organic radical selected from:(a) alkyl radicals having 1 to 25 carbon atoms;(b) cyclo alkyl radicals having 5 to 25 carbon atoms;(c) aralkyl and/or aryl radicals having 6 to 18 carbon atoms, and(d) polymeric chains containing hetero atoms selected from polyether, polythioether, polyester, polycarbonate and polyacetal chains.The amidine improves the stability of compositions comprising high and low molecular weight polyols.
摘要:
A reaction system for use in making a reaction injection moulded elastomer, said system comprising the following components:(A) a polyisocyanate composition comprising a reaction product of a stoichiometric excess of an organic polyisocyanate and:(i) a polymeric polyol having an average nominal hydroxyl functionality greater than 2 and an average hydroxyl equivalent weight of from about 500 to about 5000, and(ii) a polymeric polyamine having an average nominal primary and/or secondary amino functionality of from about 2 to about 3 and an average amine equivalent weight of from about 500 to about 5000, the polyol and the polyamine having glass transition temperatures below room temperature.(B) an isocyanate-reactive composition comprising at least one imino-functional compound.
摘要:
A process of identifying terms or sets of terms in target domains having functional relationships (roles) analogous to terms (contained in the query) selected from a source domain whereby queryrelevant but semantically distant (novel) analogies may be retrieved, corresponding to any user defined query. The process is capable of discovering deep functional analogies between terms in source and target domains, even where there is a misleading superficial matching of terms (i.e. same terms, with different meanings) between the query and the target domains. The process comprises the automated generation of abstract representations of source domain content, and application of the abstract representations of content to the efficient discovery of analogous objects in one or more semantically distant target domains. Said abstract representations of terms are preferably vectors in a high dimensionality space, encapsulating characteristic occurrence patterns of terms in the source domain.
摘要:
Improved sealants and adhesives derived from polyisocyanates having aromatically linked --NCO groups are cured at ambient temperatures when combined with a curing agent comprising an imino- and enamino-functional compound. These two component resin systems may be employed in fabricating multi-substrate laminates, especially those comprising lignocellulosic and cellulosic materials, such as wood and paper.
摘要:
An internal mould release composition, suitable for use in the production of moulded articles by the RIM process, comprising:a) a metal salt of an organic acid, said metal salt having mould release properties, andb) a compatibilizing amount of an amidine or imidate compound.
摘要:
A polyisocyanate composition comprising a reaction product of a stoichiometric excess of an organic polyisocyanate and:(i) a polymeric polyol having an average nominal hydroxyl functionality greater than 2 and an average hydroxyl equivalent weight of from about 500 to about 5000, and(ii) a polymeric polyamine having an average nominal primary and/or secondary amino functionality of from about 2 to about 3 and an average amine equivalent weight of from about 500 to about 5000, the polyol and the polyamine having glass transition temperatures below room temperature. The composition is especially useful in the production of elastomers by the RIM process.
摘要:
Internal mould release compositions suitable for use in the production of moulded articles by the RIM process, comprises a blend of a metal salt of an organic acid and a polysiloxane polymer having isocyanate reactive organic groups and optionally a compatibilizing amount of an amidine or imidate compound.
摘要:
A method of making a reaction injection moulded elastomer which includes injecting into a mould cavity a reaction mixture including:(A) an organic polyisocyanate, and(B) an isocyanate-reactive composition comprising the reaction product of:(a) the reaction product of a polyol or polythiol having an average hydroxyl or thiol functionality of from about 1.5 to about 6 and an average molecular weight of from about 100 to about 12,000 and an acylating agent, and(b) a polyfunctional compound which is capable of reacting with reactant (a) to provide a product containing a plurality of isocyanate-reactive groups.