摘要:
In various embodiments, the present invention relates to a series 3D printable, biodegradable, poly(propylene fumarate) derivative ABA type triblock copolymers having a flexible propylene succinate core unit synthesized through ring-opening copolymerization using a Mg(BHT)2(THF)2 catalyst followed by isomerization. 3D printing utilizing thiol-ene chemistry yield precise structure with improved build time. 3D printed products are fully degraded in hydrolytic conditions and the mechanical properties and degradation rate can be tailored by the polymer composition and resin formulation.
摘要:
A polyester resin is the reaction product of plurality of a first compound and a plurality of a carboxylic acid anhydride. The first compound has hydroxyl groups. The carboxylic acid anhydrides react with the hydroxyl groups of the first compounds to form a plurality of first intermediate compounds. These first intermediate compounds have at least one hydroxyl group and carboxylic acid groups. A temperature of the first intermediate compounds is increased until the hydroxyl group of one first intermediate compound condenses with one of the carboxylic acid groups of another first intermediate compound. This condensing, or condensation, forms the polyester resin having an ester linkage and carboxylic acid groups. A second compound having at least one epoxy group and a carbamate compound can be subsequently reacted with the polyester resin. A coating composition includes the polyester resin and a cross-linking agent reactive with the polyester resin.
摘要:
The present invention is directed to a polyester polycarbamate polymeric pigment dispersant to be used as a grind resin to incorporate pigment into pigment dispersions for coating compositions. The pigment dispersant is the reaction product of a first compound having a plurality of hydroxyl groups, a carboxylic acid anhydride, a second compound having at least one epoxy group, and a carbamate compound. The present invention is also directed to a method of preparing the pigment dispersant.
摘要:
A polyester composition has a number average molecular weight M.sub.n of between about 500 and about 1000, a weight average molecular weight M.sub.w of between about 600 and about 2000, a polydispersity below about 2, preferably below about 1.8, hydroxyl functionality between 2 and 3, a hydroxyl value of between about 160 and about 260, and an acid number below about 10. Less than about 5% of the OH groups of the polyester are pendent, the rest being terminal. Between about 10 and about 50 wt % of the monomers used to form the polyester composition are anhydrides having the formula: ##STR1## where R.sup.1 is a non-aromatic, saturated or unsaturated hydrocarbon chain having between 6 and 30 carbon atoms, R.sup.2 is hydrogen or a non-aromatic saturated or unsaturated hydrocarbon having between 1 and 8 carbon atoms, and R.sup.1 and R.sup.2 have, in total, between 8 and 30 carbon atoms. The polyester in conjunction with a hydroxyl-reactive curative provides a coating composition.
摘要:
A process for polymerizing oxiranes, oxetanes, oxepanes, dioxolanes, trioxanes, and tetrahydrofurans to their respective polymers by contacting them with a selected metal compound is disclosed; and also a process for depolymerizing polytetrahydrofurans to monomeric tetrahydrofurans by contacting the polymer with a selected metal compound at a temperature of about 100.degree. C. to about 250.degree. C. The catalysts may be in solution or part of a heterogeneous solid, and selected organic compounds are used as accelerators in the polymerizations. The polymeric products, some of which are novel, may be used as polyether monomers for further polymerization, as by reaction with isocyanates to produce polyurethanes, and other useful polymers. Some of the polymeric products are relatively high in molecular weight and are suitable for direct use, for instance as spandex fibers.
摘要:
Photosensitive compositions comprisinga) 5-95% by weight of a polyester of formula I, II or III ##STR1## wherein R.sub.1 is the radical of a cyclic anhydride of a dicarboxylic acid after removal of the --O--CO--O-- grouping, which radical may be substituted by C.sub.1 -C.sub.22 alkyl, C.sub.5 -C.sub.10 cycloalkyl, C.sub.3 -C.sub.6 alkenyl, C.sub.6 -C.sub.10 aryl, halogen or C.sub.1 -C.sub.22 alkyl which is interrupted by --O-- or --CO--O--,R.sub.2 is hydrogen, unsubstituted or halogen-substituted C.sub.1 -C.sub.22 alkyl, C.sub.5 -C.sub.10 cycloalkyl, C.sub.7 -C.sub.22 aralkyl, C.sub.6 -C.sub.10 aryl or a radical --CH.sub.2 --O--R.sub.5 or --CH.sub.2 --O--CO--R.sub.5, wherein R.sub.5 is C.sub.1 -C.sub.22 alkyl, C.sub.5 -C.sub.6 cycloalkyl or C.sub.6 -C.sub.10 aryl,R.sub.3 is hydrogen, orR.sub.2 and R.sub.3, together with the linking carbon atoms, are a cyclopentylene or cyclohexylene radical,R.sub.4 is a radical of 4 to 12 carbon atoms which carries an unsaturated end group and carboxyl or ether groups,A is a mono- or polyfunctional low molecular or high molecular carboxylate or alcoholate,x is an integer from 0-100,n is an integer from 2-150, andz is an integer from 1-4,b) 10-90% by weight of a liquid polyfunctional aliphatic, cycloaliphatic or aromatic (meth)acrylate,c) 0-70% of a mono(meth)acrylate or mono-N-vinyl compound with a molecular weight of not more than 500,d) 0.1-10% by weight of a photoinitiator, ande) 0-10% by weight of optional customary additives.
摘要:
The invention relates to a process for condensing at least one epoxide on at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst consisting of at least one titanium nitrogenous complex of the formula (I) Ti(OR.sup.1).sub.m (OR.sup.2 ).sub.n (OR.sup.2 ).sub.p Lg in which R.sup.1, R.sup.2 and R.sup.3 each independently represents one hydrocarbon group, L represents the remainder of a nitrogenous compound, the sum of m+n+p+q is 4, q is an integer from 1 to 4 and m, n and p are independently each 0 or 1. The process allows for obtaining a perfectly alternating polyester.
摘要翻译:本发明涉及一种在由至少一种式(I)Ti(OR 1)m(OR 2)的钛氮配合物组成的催化剂存在下将二羧酸的至少一种环状酸酐缩合的方法, n(OR2)p Lg,其中R1,R2和R3各自独立地表示一个烃基,L表示含氮化合物的剩余部分,m + n + p + q的和为4,q为1至4的整数 并且m,n和p各自独立地为0或1.该方法允许获得完全交替的聚酯。
摘要:
A polyester composition having an average molecular weight of greater than 500 comprising a most prevalent compound having a main polyester chain containing at least 17 and fewer than 52 carbon atoms and at least 6 and fewer than 18 oxygen atoms, at least 52 weight percent of the molecules of said composition having a molecular weight within 50% of the average molecular weight of the composition. The polyester composition desirably contains at least 1.6 equivalents of unreacted hydroxy groups or at least 1.6 equivalents of unreacted carboxy groups per mole. The composition contains at least four equivalents of ester links in the main chains of the molecules per mole.The composition of the present invention is obtained by the method of the invention wherein alternating series of reactions are each driven essentially to completion where the final molecule of each reaction provides the only available reaction site for the next alternate monomer reaction. The reactions used are the reaction of an anhydride with a hydroxyl to give an ester and a carboxyl group and the reaction of an oxirane group with a carboxyl to give an ester and a hydroxyl group. To start the alternating reaction sequence either a polyol (to react with anhydride) or a polycarboxylic acid (to react with an oxirane) is used.
摘要:
The invention provides a process for the production of a foamed polyester which comprises initiating a reaction between a poly-terminal epoxide, a mono-terminal epoxide and a cyclic diacid anhydride in the presence of a catalytically effective quaternary salt and a blowing agent, heating to a point at which the reaction becomes a self-sustaining exothermic reaction and controlling the reaction such that the temperature of the mixture is not reduced until after the exothermic reaction has begun to subside.BACKGROUND OF THE INVENTION
摘要:
The present invention provides a process for the production of a polyester having an acid number which is not greater than 65 which comprises reacting an acid anhydride with a monoterminal epoxide in the presence of a solvent for the polyester in such a way that a self-sustaining reaction is initiated within 200 seconds of the reactants being mixed together and said reaction results in the attainment of a maximum peak temperature within 200 seconds of initiation.