Abstract: A superabsorbent, thermoplastic polymeric composition comprising:(A) from about 86 to about 98 percent by weight, based on the total weight of the composition, of a poly(oxyethylene) diol soft segment having a weight average molecular weight in the range of from about 5,000 to about 50,000; and(B) from about 2 to about 14 percent by weight, based on the total weight of the composition, of a hard segment which has a melting point above ambient temperature and below the temperature at which decomposition of either the composition or the soft segment takes place, is essentially insoluble in water, and phase separates from the soft segment, said hard segment being selected from the group consisting of polyurethanes, polyamides, polyesters, polyureas, and combinations thereof;wherein the soft and hard segments are covalently bound together by means of urethane, amide, ester, or secondary urea linkages or combinations thereof.

Abstract: A solution of a non-reactive polymer in a liquid oxazoline which may include a reactive additive such as a polyisocyanate to provide solid polymers by interpolymerization of the oxazoline and reactive additive are described.

Abstract: (1) Pyrrolidonyl acrylate block polymers having the formula ##STR1## wherein n has a value of 1 to 3; X and X' are dissimilar and each is hydrogen or methyl; y and z each have a value of from 1 to 40, except that at least one of y and z is greater than 1 and R is hydrogen or methyl;(2) preparation of said polymers and(3) uses of said polymers.

Abstract: Incorporation of 0.6-5.0 weight percent of certain ethylene oxide/propylene oxide copolymers into polyacetal molding compositions results in improved hydrolytic stability of such compositions.

Abstract: A polyester fiber having a superior stainproof property comprises at least one fiber-forming polyester copolymer comprising a backbone polyester polymer and at least one type of terminal substituent which blocks at least some of the terminals of the molecules of the backbone polyester polymer and which substituent consists of a polyoxyalkyleneglycol monoether group of the formula (I):R.sup.1 -O--R.sup.2 -O.sub.n (I)wherein R.sup.1 is a monovalent organic radical free from active hydrogen atom, R.sup.2 is an alkylene radical, and n is an integer of 2 or more.

Abstract: Hydroxyaromatic oligomers are prepared by (I) reacting (A) an aromatic hydroxyl-containing material such as bisphenol A with (B) a cyanogen halide such as cyanogen bromide in the presence of a base such as triethylamine and (II) co-oligomerizing the cyanate-containing product from (I) with (C) a polymaleimide such as the reaction product of maleic anhydride with methylenedianiline optionally in the presence of (D) a co-oligomerization catalyst such as cobalt naphthenate. These oligomers are useful in the preparation of epoxy resins.

Abstract: Thermoplastic and thermoset materials containing an effective amount of an antistatic agent for improving antistatic properties thereof, the antistatic agent is selected from homopolymers and copolymers of an epihalohydrin.

Abstract: A diblock copolymer is disclosed having a first block of a polyalkylene oxide and a second block of glycolic acid ester and trimethylene carbonate linkages. A triblock copolymer is disclosed having a middle block obtained from an ethylene oxide homopolymer or a copolymer of ethylene oxide and a cyclic ether. Alternatively, the triblock copolymer middle block is obtained from a copolymer of formula (I): ##STR1## and formula (II): ##STR2## The copolymers are useful in medical and surgical applications.

Abstract: A polyetherimide ester composition comprising the reaction products of:(i) a mixture of at least one high molecular weight diol and at least one low molecular weight diol; and(ii) a set of reactants selected from(a) (i) at least one high molecular weight poly(oxy alkylene)diamine, and (ii) at least one tricarboxylic acid or a derivative thereof, or(b) at least one high molecular weight polyoxyalkylene diimide diacid.Also a polyetherimide ester composition comprising the reaction products of:(i) at least one high molecular weight diol; and(ii) a set of reactants selected from(a) (i) at least one high molecular weight poly(oxy alkylene)diamine, and (ii) at least one tricarboxylic acid or a derivative thereof, or(b) at least one high molecular weight polyoxyalkylene diimide diacid.

Abstract: A process for preparing a nylon-6 block copolymer in which a solution comprising an acyllactam, epsilon-caprolactam and magnesium chloride is brought into reactive admixture with a solution of magnesium dilactam in epsilon-caprolactam. The acyllactam magnesium chloride solution is prepared by reaction of an acid halide functional material and magnesium dilactam.

Abstract: The room temperature-curable polymeric composition is prepared by admixing (a) a polyether terminated at both molecular chain ends each with a mercapto group with (b) a 3-methacryloxypropyl silane having at least two hydrolyzable groups, e.g. alkoxy groups, in a molecule and (c) a 1,1,3,3-tetramethyl guanidino-containing organosilicon compound. The component (b) first reacts with the mercapto group of the component (a) to introduce silicon-bonded hydrolyzable groups to the molecular chain ends of the polyether and the silicon-bonded hydrolyzable groups pertain to the crosslinking reaction with the atmospheric moisture. The composition has good storability and workability and is capable of giving a cured rubbery elastomer without the addition of a toxic lead compound as a curing catalyst which is indispensable in the conventional polyether-based room temperature-curable polymeric compositions.

Abstract: Polyamide and poly(ester-amide) materials are melt-blended to give products having good flexibility at high and low temperatures. The blends are useful for potting, encapsulating, and adhesive applications.

Abstract: Hydroxyaromatic oligomers are prepared by (I) reacting (A) an aromatic hydroxyl-containing material such as bisphenol A with (B) a cyanogen halide such as cyanogen bromide in the presence of a base such as triethylamine and (II) co-oligomerizing the cyanate-containing product from (I) with (C) a polymaleimide such as the reaction product of maleic anhydride with methylenedianiline optionally in the presence of (D) a co-oligomerization catalyst such as cobalt naphthenate. These oligomers are useful in the preparation of epoxy resins.

Abstract: Novel diimide diacids and modified polyetherimide esters are prepared therefrom by reacting diols, dicarboxylic acids and a combination of the novel diimide diacid and dimer acid. These compositions have many excellent properties which make them particularly useful for extrusion and molding applications.

Abstract: This application discloses a synthetic resin based on alcohol-modified polyepoxides. The synthetic resin can be prepared by reacting a diepoxide, or a mixture of diepoxides, having an epoxide equivalent weight of less than about 500, with compounds with a hydroxyl group, which is reactive towards epoxide groups, in a molar ratio from about 2:1 to about 7:6 at temperatures from about 100.degree. C. to about 180.degree. C. in an organic solvent free of hydroxyl groups. The synthetic resin has terminal epoxide groups and a mean molecular weight from about 400 to about 5000.

Abstract: A process for preparing a nylon block copolymer which comprises bringing into reactive contact lactam monomer, basic lactam polymerization catalyst and a composition containing one or more lactam functional materials selected from the group represented by the formula: ##STR1## wherein, Q is ##STR2## with Y=C.sub.3 -C.sub.11 alkylene; b is an integer equal to 2 or more;R.sub.1 is an alkyl, aryl, aralkyl, alkyloxy, halogen, aryloxy, or aralkyloxy group;Z is a segment of: (1) a polyether, provided said polyether is not solely polyarylene polyether; (2) a polyester containing polyether or polymeric hydrocarbon segments (3) a hydrocarbon; (4) a polysiloxane; or (5) combinations thereof.

Abstract: A composition containing lactam functional materials, which are useful in the preparation of nylon block polymers, selected from the group consisting of: ##STR1## wherein, Q is ##STR2## with Y=C.sub.3 -C.sub.11 alkylene; b is an integer equal to 2 or more;R.sub.1 is an alkyl, aryl, aralkyl, alkyloxy, halogen, aryloxy, or aralkyloxy group;Z is a segment of: (1) a polyether, provided said polyether is not solely polyarylene polyether; (2) a polyester containing polyether or polymeric hydrocarbon segments (3) a hydrocarbon; (4) a polysiloxane; or (5) combinations thereof.

Abstract: Antistatic synthetic fibers composed of (A) a fiber-forming synthetic polymer and (B) a block copolymer containing a polyalkylene oxide component, the block copolymer (B) being incorporated in the polymer (A) substantially continuously along the fiber axis in the form of bands or a network.

Abstract: A nylon block copolymer prepared from acyl lactam functionalized materials and lactam monomer and cross-linked by a polyfunctional amine.

Abstract: Thermoplastic polyester and polyesterether compositions having improved flame retardance, smoke generation and heat aging, reduced blooming and superior high temperature processability comprise a thermoplastic polyester or polyesterether resin derived from 1,4-butanediol and dimethyl terephthalate, antimony oxide, optionally fiberglass, and a chlorinated bisimide of the formula ##STR1##

Abstract: A composite consisting essentially of a polymer matrix and thermoplastic elastomeric fibers is disclosed. During preparation, elastomeric fibers are embedded in polymer or polymer precursor under from about 0 tension to tension only sufficient to eliminate slack and develop tension as the composite is formed. The composite is impact resistant and capable of elongation.

Abstract: A process for preparing a nylon block polymer which comprises bringing into reactive contact lactam monomer, basic lactam polymerization catalyst and a composition containing one or more acyllactam functional materials selected from the group consisting of: ##STR1## wherein, Q is ##STR2## with Y=C.sub.3 -C.sub.11 alkylene; a is an integer equal to 1, 2 or 3;b is an integer equal to 2 or more;R is a di- or a poly- valent group selected from hydrocarbon groups and hydrocarbon groups containing ether linkages;Z is a segment of: (1) a polyether or polymeric hydrocarbon; (2) a polyester containing polyether segments (3) a hydrocarbon; (4) a polysiloxane; or (5) combinations thereof.

Abstract: A composition containing acid halide functional materials, which are useful in the preparation of nylon block polymers, selected from the group consisting of: ##STR1## wherein, X is a halogen;a is an integer equal to 1, 2 or 3;b is an integer equal to 2 or more;R is a di- or a poly-valent group selected from hydrocarbon groups and hydrocarbon groups containing ether linkages;Z is a segment of: (1) a polyether; (2) a polyester containing polyether polyester hydrocarbon segments, (3) a hydrocarbon; (4) a polysiloxane; or (5) combinations thereof.

Abstract: Composition for use in preparing a nylon-6 block copolymer in which a solution comprising an acyl-lactam, epsilon-caprolactam and magnesium chloride is brought into reactive admixture with a solution of magnesium dilactam in epsilon-caprolactam. The acyl-lactam magnesium chloride solution is prepared by reaction of an acid halide functional material and magnesium dilactam.

Abstract: A polymer composition is disclosed. The polymer is comprised of a polymer (A) having a sulfo and/or carboxy ammonium zwitterion structure and an organic synthetic polymer (B), wherein either of the following condition (i) or (ii) is satisfied: (i) (A) is a polymer having 0 to 80% by weight of the polyalkylene oxide component, and (ii) (A) is a copolymer having 80% by weight or more of the polyalkylene oxide component and (B) is a polymer comprising polyalkylene oxide as a copolymer component. The polymer composition can be used in the production of fibers, films and other shaped articles. The products utilizing the disclosed polymer composition have excellent hydrophilic properties which are maintained even after exposure to numerous washings.

Abstract: A composition containing acyllactam functional materials, which are useful in the preparation of nylon block polymers, selected from the group consisting of: ##STR1## wherein, Q is ##STR2## with Y=C.sub.3 -C.sub.11 alkylene; a is an integer equal to 1, 2 or 3;b is an integer equal to 2 or more;R is a di- or a poly- valent group selected from hydrocarbon groups and hydrocarbon groups containing ether linkages;Z is a segment of: (1) a polyether; (2) a polyester containing polyether or polymeric hydrocarbon segments; (3) a hydrocarbon; (4) a polysiloxane; or (5) combinations thereof.

Abstract: A two part RIM nylon-based urethane block polymer consists of an anionic metal salt catalyst in minor proportions and a prepolymer consisting of the reaction product of a diisocyanate with a mixture of a polymeric triamine having primary amine groups and a polyether diol in a large excess of a ring lactam which serves as a reaction diluent. The prepolymer preparation process is characterized by the immediate formation of a visible high molecular weight polymer gel which redissolves with continued agitation. No free or extractable polymers, diols or isocyanate is observed in the polymer product.

Abstract: A one component room temperature curable sealant composition comprising:(A) a polyether polymer having at its terminal a hydrolyzable silicone functional group represented by the general formula: ##STR1## (B) a partial addition condensation product of: (a) an aminoalkylalkoxysilane represented by the general formula: ##STR2## with (b) an epoxy compound containing at least one epoxy group in its molecule and having a molecular weight of from 100 to 1000 and an epoxy equivalent of from 100 to 500,(c) a compound represented by the general formula: ##STR3## (d) an alkoxy silane represented by the general formula: ##STR4## (e) an organic titanic acid ester; and (C) a condensation catalyst of a silanol compound.

Abstract: The fast crystallizing polyalkyleneterephthalate resin compositions disclosed herein contain 0.05-4 percent by weight of a sodium salt of a hydrocarbon acid having the formula R.degree.(COO).sub.y Na.sub.z wherein R.degree. is a hydrocarbon group having a valency of y and having 1-25 carbon atoms therein, preferably 1-10 carbon atoms, y is an integer having a value of at least one, advantageously 1-10 and preferably 1-3, and z is an integer having a value of at least one and no greater than the value of y, this sodium salt of the hydrocarbon acid being in the form of a complex with a polymeric compound, which contains at least two recurring units of the formula --CH.sub.2 CH.sub.2 O--, together with reinforcing agents, fillers and/or additives and optionally a flow promoter selected from low molecular weight organic esters or polymers containing a recurring structure of [(CH.sub.2).sub.x O--].sub.

Abstract: Polyamide fibers are disclosed, said fibers comprising, as a distinct phase, from about 0.4 to about 10 weight percent, based upon weight of polyamide, of an additive mixture consisting essentially of(a) from 75 to 95 percent by weight of a low molecular weight poly(alkylene ether) component having an average molecular weight from about 1000 to about 6000; and(b) from 25 to 5 percent by weight of a high molecular weight poly(alkylene ether) component having an average molecular weight from about 70,000 to about 1,000,000.

Abstract: A hydroxyl-functional polymer is reacted with a compound ZCO.N(H).sub.x.N(H).sub.x.CO.OR, where Z is halogen or aryloxy, x is 0 or 1 and R is hydrocarbon, and the reaction product is if necessary oxidized to give an azodicarboxylate functional polymer having the formula QOCO.N:N.CO.OR where Q is an inert polymer group. This polymer is used to react with ethylenically unsaturated natural or synthetic rubber so as to graft groups derived from the polymer on the rubber backbone.

Abstract: Polyamide compositions comprising:(a) poly(.epsilon.-caprolactam) resin of viscosity average molecular weight of at least about 15,000; and(b) at least one block polymer having(i) from about 25 to about 80 weight percent poly(.epsilon.-caprolactam) segments of the formula ##STR1## wherein x is an integer equal to 5 or more; and (ii) from about 75 to about 20 weight percent of segments having a number average molecular weight of at least 300 selected from the group consisting of segments of poly(propylene oxide), polycaprolactone, polytetrahydrofuran, polybutadiene, polyisoprene, polyisobutylene, poly(C.sub.1 -C.sub.8 alkylene acrylate), poly(C.sub.1 -C.sub.

Abstract: An improved polyester type block copolymer composition having a rubber-like elasticity, particularly having excellent heat resistance and water resistance, which comprises a polyester type block copolymer produced from a crystalline aromatic polyester and a lactone in melt-admixture with at least one epoxy compound and optionally further with a carboxylic acid compound selected from an ethylene-carboxylic acid copolymer and an aliphatic carboxylic acid metal salt.

Abstract: Improved electron beam curable compounds are prepared by mixing 100 weight parts of (1) polyurethanes prepared from polymeric polyols, organic diisocyanates and polyethers having terminal hydroxyl and unsaturated groups, or terminal hydroxyl and pendant unsaturated groups with (2) 1 to 25 weight parts of an acrylate or alkacrylate terminated polyurethanes prepared by reacting isocyanate terminated prepolymers of hydroxyl terminated polymers with hydroxyl-terminated acrylates or alkacrylates. Compositions of this blend may be crosslinked or cured in a few seconds by electron beam to provide an improved stable coating that can be cured to a variety of hardnesses. These polyurethanes combined with phenoxy resins also form particularly useful binder systems for magnetic tape.

Abstract: Copolyether ester amides having a melting point between about 85.degree. and 140.degree. C. from:(A) lactams of omega-aminocarboxylic acids and/or equivalent amounts of dicarboxylic acids and diamines as polyamide-forming compounds; and(B) dicarboxylic acids and polyalkylene oxide diols as polyether ester forming compounds as thermoplastic adhesives for heat sealing textiles, wherethe polyamide forming compounds consist of at least 30% by weight of lauryllactam and the remaining compounds together with lauryllactam result in copolyamides which have melting points which lie in the range between about 90.degree. to 150.degree. C.;aliphatic dicarboxylic acids are used as the dicarboxylic acids; andcomponents A and B are used in the weight ratio from 93/7 to 35/65.

Abstract: Poly(glycolic acid)/poly(oxyalkylene) ABA triblock copolymers having the following formula: ##STR1## and wherein x and y have values which correspond to a total polyglycolide content of about 75 to 95 weight percent and a total polyoxyalkylene content of about 5 to 25 weight percent. The copolymers are useful for manufacturing fibers possessing a sufficiently low modulus of elasticity to permit their use as absorbable sutures having the requisite flexibility for use in monofilament form. A process of preparation involves purifying the hydroxyl-ended poly(oxyalkylene) and allowing it to react with glycolide to produce an ABA triblock copolymer of extrusion grade in which A represents a polyglycolic acid block and B represents a poly(oxyalkylene) block.

Abstract: Improved electron beam curable compounds are prepared by mixing 100 weight parts of (1) polyurethanes prepared from polymeric polyols, organic diisocyanates and polyethers having terminal hydroxyl and unsaturated groups, or terminal hydroxyl and pendant unsaturated groups with (2) to 1 to 25 weight parts of an acrylate or alkacrylate terminated polyurethanes prepared by reacting isocyanate terminated prepolymers of hydroxyl terminated polymers with hydroxyl-terminated acrylates or alkacrylates. Compositions of this blend may be crosslinked or cured in a few seconds by electron beam to provide an improved stable coating that can be cured to a variety of hardnesses. These polyurethanes combined with phenoxy resins also form particularly useful binder systems for magnetic tape.

Abstract: New bisesters of alkenylsuccinic acids and ethylene oxide/propylene oxide block polymers, which are obtained by reaction of alkenylsuccinic anhydride of the Formula 1 ##STR1## wherein R denotes branched or unbranched C.sub.2 -C.sub.20 alkyl, with an ethylene oxide/propylene oxide block polymer of the Formula 2 ##STR2## wherein R denotes methyl or ethyl, n and m are numbers selected such that the polyethylene oxide contribution to the total molecule is 5 to 80% of the molecular weight and p is a number from 10 to 70, and their use as demulsifiers for oil-water emulsions, as corrosion-protective agents and as dispersants for dyestuffs.

Abstract: Multiblock copolymers having the following general formula: ##STR1## where R represents alkylene and Ar is an aromatic group, are obtained by transesterification of poly(glycolic acid) and an hydroxyl-ended poly(alkylene glycol) such as poly(oxyethylene) in the presence of a catalyst with the degree of polymerization of the copolymer being increased by the subsequent addition of an aromatic orthocarbonate such as tetra-p-tolyl orthocarbonate. The copolymers find use in the manufacture of surgical articles, particularly absorbable monofilament sutures possessing the desired characteristics of flexibility, resulting in good handling properties, and biodegradability.

Abstract: The fast crystallizing polyalkyleneterephthalate resin compositions disclosed herein contain 0.05-4 percent by weight of lithium bromide, chloride or iodide in the form of a selected complex of the lithium halide (LiX) and an organic compound, such as a polymeric compound, which contains at least two recurring units of the formula --CH.sub.2 CH.sub.2 O-- together with reinforcing agents, fillers and/or additives and optionally a flow promoter selected from low molecular weight organic esters or block copolymers containing a recurring structure of [(CH.sub.2).sub.x O--].sub.m wherein x is an integer of no more than 5 and m is an integer ranging from 2, preferably from 200 to about 5,000. The amount of complex is such as to give 0.05 to 4 percent, preferably 0.1-2 percent by weight of LiX based on the weight of polyalkyleneterephthalate.

Abstract: A polyester copolymer, suitable for an adhesive, is obtained by copolymerizing(A) terephthalic acid or a mixture of more than 50 mol % of terephthalic acid and at least one kind of dicarboxylic acid selected from aromatic dicarboxylic acids excluding terephthalic acid and aliphatic dicarboxylic acids,(B) a low-molecular weight diol composed of 1 to 50 mol % of 2-methyl-1,3-propanediol and 99 to 50 mol % of 1,6-hexanediol, and(C) at least one kind of high-molecular weight diol (in such an amount that the high-molecular weight diol component in the copolymer is 0 to 60 wt %) selected from polyalkylene ether glycol and polycaprolactone glycol.

Abstract: A polymerizable mixture for adhesive bonding is disclosed. The polymerizable mixture comprises a polymerizable acrylic-based material, a polymerizable epoxide-based material and a bifunctional molecular material reactable with said acrylic-based material and said epoxide-based material.

Abstract: The fast crystallizing polyalkyleneterephthalate resin compositions disclosed herein contain 0.05-4 percent by weight of NaSCN in the form of a selected complex of sodium thiocyanate (NaSCN) and an organic compound, such as a polymeric compound, which contains at least two recurring units of the formula -CH.sub.2 CH.sub.2 O- together with reinforcing agents, fillers and/or additives and optionally a flow promoter selected from low molecular weight organic esters or block copolymers containing a recurring structure of [(CH.sub.2).sub.x O--].sub.m wherein x is an integer of no more than 5 and m is an integer ranging from 2, preferably from 200 to about 5,000. The amount of complex is such as to give 0.05 to 4 percent, preferably 0.1-2 percent by weight of NaSCN based on the weight of polyalkyleneterephthalate.

Abstract: Nylon compositions are prepared by anionic polymerization of at least 75% of a lactam with up to about 25% of an epoxy component in the presence of a basic catalyst and a promoter that can be used in lactam polymerization wherein, in a preferred embodiment, the epoxy component is a modified epoxy resin containing physical property enhancing constituents. The nylon compositions are prepared by mixing a fraction of a lactam with the epoxy component and the promotor to form liquid mixture A, mixing remaining lactam with the catalyst to form liquid mixture B, mixing liquid mixtures A and B in the ratio ranging from 1/1 to 4/1 to form liquid mixture C, injecting liquid mixture C into a mold maintained at a temperature of about 100.degree. to 200.degree. C. wherein a chemical reaction takes place whereby the liquid is converted to a solidified mass in less than about 2 minutes, and removing the nylon composition in the form of a molded object.

Abstract: A process for preparing a thermosetting maleimide type prepolymer which comprises reacting (A) a polyfunctional maleimide compound, (B) a bis-maleimide, (C) a diamine and (D) an epoxy compound. The maleimide type prepolymer prepared according to the process of the present invention has rapid curability and excellent solubility in low boiling point solvents such as acetone, methyl ethyl ketone and methyl cellosolve, which are available at low cost. Accordingly, the prepolymer is advantageously used especially for the production of laminated boards having good heat resisting properties, low moisture absorption and good adhesion to various substrates such as a copper foil.

Abstract: A polyacetal suitable for moldings which are excellent in lubricity, wear and antistatic properties, which has at least one terminal of its linear polymer molecule capped with an alkylene oxide adduct of an alcohol or a carboxylic acid, which adduct is of the formula ##STR1## wherein R.sub.o is a hydrogen atom, alkyl group, substituted alkyl group, aryl group, or substituted aryl group, R.sub.o 's may be the same or different, R.sub.1 is an alkyl group, substituted alkyl group, aryl group, or substituted aryl group, R.sub.2 is a hydrogen atom, alkyl group, substituted alkyl group, aryl group, or substituted aryl group, m is from 2 to 6, and n is from 1 to 1,000; the number average molecular weight of said polyacetal being in the range from 10,000 to 500,000 excluding the terminal group.

Abstract: A co-grafted polymer comprising units of organopolysiloxanes with OH functional groups, polyesters and vinyl monomers, polymeric units of the vinyl monomers being linked to the organopolysiloxane and polyester units, is produced by polymerizing a suitable monomer dispersion. The product is suited for replacing all or some of the organopolysiloxane component in room temperature curable compositions containing organopolysiloxanes, silane cross-linking agents and a curing catalyst.

Abstract: The fast crystallizing polyalkyleneterephthalate resin compositions disclosed herein contain 0.025-2 percent by weight of NaI in the form of a selected complex of sodium iodide (NaI) and an organic compound, such as a polymeric compound, which contains at least two recurring units of the formula --CH.sub.2 CH.sub.2 O-- together with reinforcing agents, fillers and/or additives and optionally a flow promoter selected from low molecular weight organic esters or block copolymers containing a recurring structure of [(CH.sub.2).sub.x O--].sub.m wherein x is an integer of no more than 5 and m is an integer ranging from 2, preferably from 200 to about 5,000. The amount of complex is such as to give 0.025-2 percent, preferably 1-2 percent by weight of NaI based on the weight of polyalkyleneterephthalate.

Abstract: Purified hexafluoropropylene oxide is produced by scrubbing to remove impurities that inhibit polymerization of hexafluoropropylene oxide, thus permitting the preparation of polymers having a degree of polymerization of more than 200, including end-capped and chain-extended derivatives thereof.

Abstract: Polyamide compositions comprising:(a) at least one polyamide resin of number average molecular weight of at least 5000; and(b) at least one block polymer having(i) from about 30 to about 70 weight percent polyamide segments selected from ##STR1## wherein x is an integer equal to five or more and y is an integer equal to three or more;(ii) from about 70 to about 30 weight percent of segments having a molecular weight of at least 300 selected from the group consisting of segments of poly(ethylene oxide), poly(propylene oxide), polycaprolactone, polytetrahydrofuran, polybutadiene, polyisoprene, polyisobutylene, poly(C.sub.1 -C.sub.8 alkylene acrylate), poly(C.sub.1 -C.sub.4 dialkylene siloxane), poly(ethylene-co-propylene), poly(ethylene-co-carbon monoxide) and combinations thereof; said (ii) segments being connected to an (i) polyamide segment through groups selected from amide, ester, urea, carbamate and imide; and(iii) greater than 0.