摘要:
The invention concerns an N-substituted carbamoyl-lactam compound characterized by the formula: ##STR1## where in the formula: R is a polyol radical from a polyol having the formula R--(OH).sub.xi, where .sub.xi is an integer.gtoreq.2R' is an alkyl, whether or not cyclic aralkyl, alkaryl or aryl group, .sub.yi is an integer>0,(--L) is an unopened lactam ring and(--L--) is an opened lactam block. The compoundsare highly suited for use as activators in preparing nylon block copolymers.
摘要:
The invention concerns a simple, reliable and reproducable process for the preparation of an N-substituted carbamoyl lactam compound, for example of the following formula: ##STR1## where: R is a polyol originating from a polyol having the formula R-(OH).sub.xi, where.sub.xi is an integer.gtoreq.2R' is an alkyl, aralkyl, alkaryl or aryl group, whether or not cyclic,.sub.yi is an integer.gtoreq.0,(--L) is an unopened lactam ring and(--L--) is an opened lactam block.This process is characterized in that a polyol and a lactam blocked polyisocyanate are reacted in the liquid state in the presence of a metal compound catalyst.
摘要:
The present invention provides a molded product composed of a polymer alloy of a polyamide polymer and at least one polyurethane polymer, polyurea polymer, and/or polyisocyanurate polymer. The polymer alloy is an interpenetrated network of different polymers, a semi-interpenetrating network of different polymers, or a polyblend of different polymers.Reactant streams containing the compounds for forming the polymers of the polymer alloy are admixed to form a reaction mixture. The liquid reaction mixture is preferably a substantially homogeneous mixture of the reactant compounds. Each reactant stream thus contains only a portion of the components required to obtain the polymer alloy product. The resulting mixture is then rapidly introduced into a mold wherein chemical reaction takes place and the polymer alloy forms. Preferably, the mold is heated. The solid polymer alloy product is then recovered from the mold.
摘要:
A reaction injection molding process is disclosed comprising:introducing a mixture of substantially stable reactant streams into a mold, said mixture, in the aggregate, containing polyamide polymer forming compounds and polyurethane polymer forming compounds, said polyamide polymer forming compounds including lactam, an anionic polymerization catalyst and a polymerization activator, said polyurethane polymer forming compounds including a polyol, a polyisocyanate, a chain extender if desired, and a polyurethane polymerization catalyst, said polyamide polymer forming compounds and said polyurethane forming compounds reacting to respectively form polyamide and polyurethane polymers in said mold to thereby yielding a reaction injection molded product composed of said polymers; andrecovering said product from said mold.
摘要:
An improved process for the preparation of copolymers of .alpha.-methylstyrene and other co-monomers such as acrylonitrile styrene, methyl methacrylate and the like, wherein a substantially water-immiscible softener is employed, particularly prior to coagulation of the latex formed of the copolymer, whereby an improved product of higher bulk density and easier to employ in a subsequent processing is obtained.
摘要:
An improved process for the preparation of heat resistant copolymers of an alpha-methylstyrene and acrylonitrile by polymerization thereof in aqueous emulsion, and in the presence of a free-radical-supplying compound and a chain-transfer agent. The polymerization reaction is insufficiently cooled to remove all of the released reaction heat, and in combination therewith the polymerization is conducted at a temperature of the aqueous emulsion maintained at a level of at most 110.degree., while further maintaining the mean rate of temperature increase per hour, v, at a value of at most 60.degree. C. per hour, wherein v is determined by the formula: ##EQU1## in which: T.sub.m =maximum temperature of the aqueous emulsion (.degree.C.),T.sub.o =temperature of the aqueous emulsion at the start of the polymerization (.degree.C.)t.sub.m =time in hours at which T.sub.m is reached, andt.sub.o =time in hours at which the polymerization is started whereby the rate of monomer conversion is maximized.
摘要:
An N-substituted carbamoyl-lactam compound of the formula ##STR1## wherein R is a di-valent radical derived from polytetramethylene glycol, R' is an at least divalent radical derived from a diisocyanate, Y is a C.sub.3 -C.sub.14 ring-forming alkylene group, and a has a value of at least 1 and is a number corresponding to the mean functionality of the aforesaid polyisocyanate minus 1. A process for preparing the N-substituted carbamoyl-lactam compound is also described.
摘要:
The invention relates to a heat resistant polymer composition based on one or more graft copolymers of styrene and acrylonitrile on a rubber and a copolymer of .alpha.-methylstyrene and acrylonitrile.This composition comprises:A. A graft copolymer obtained by polymerizing 50-80 parts by weight of a monomer mixture consisting of20-40% by weight of acrylonitrile,50-80% by weight of styrene and0-30% by weight of one or more other monomers in the presence of 20-50 parts by weight of rubber (in respect of 100 parts by weight of graft copolymer) andB. a copolymer of .alpha.-methylstyrene and acrylonitrile obtained by polymerizing a mixture of 60-80 parts by weight of .alpha.-methylstyrene and 20-40 parts by weight of acrylonitrile, of which copolymer the spiral flow length (S) is at least 65 and the flow index (V) 45 at most, and the ratio between spiral flow length and the flow index is at least 3.0, and in which polymer composition 35 to 80% by weight of copolymer of .alpha.-methylstyrene and acrylonitrile is present.
摘要:
The invention relates to a process for preparing an N-substituted carbamoyl-lactam compound having the formula: ##STR1## by admixing a polyhydroxy compound having the formula R(OH).sub.n with a polyisocyanate having the formula OCH--R'--NCO, wherein saidn has a value of at least 3,R' is a di-valent hydrocarbon group having 6-25 carbon atoms, andY is a C.sub.3 -C.sub.14 alkylene group,and reacting the product thereof with a lactam. The n value may advantageously range from 3 to 10. The invention also relates to certain novel n-substituted carbamoyl-lactam compounds which can advantageously be used in the preparation of nylon 6 block copolymers, and are particularly useful in reaction injection molding nylon 6.
摘要:
An improved process for the preparation of copolymers by the polymerization of from about 25 to 85 parts by weight of a styrene and/or .alpha.-methylstyrene monomer together with about 15-75 parts by weight of acrylonitrile and/or methacrylonitrile monomer in an aqueous dispersion in the presence of a compound yielding free radicals is disclosed whereby the quantity of monomer remaining in the copolymer after polymerization is substantially reduced. A compound yielding water-soluble free radicals is added to the aqueous reaction medium, containing copolymer as well as non-converted monomer, in a quantity of between about 0.05 and 2.5 parts per 100 parts by weight of monomer and copolymer present in the reaction medium, at a point of time at which (a) the rate of conversion of monomer to copolymer is less than 15% per hour, (b) the degree of conversion of monomer to copolymer is greater than 75%, and (c) at least 0.1 weight percent of non-converted acrylonitrile and/or methacrylonitrile relative to the total weight of the reaction medium, remains in the reaction medium, and whereafter no additional monomer is added.