摘要:
Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.
摘要:
Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.
摘要:
Novel coating compositions are disclosed which comprise aqueous dispersions of polyamine resins in the form of their acid salts along with azetidinedione crosslinking agents and other optional adjuvants.The compositions give rise to improved methods for the electrodeposition of heat-curable films on substrates.The compositions and methods find particular utility in the cathodic deposition of coatings and films on automotive parts and household appliances.
摘要:
The invention discloses a cross-linked epoxy resin with flame-retardant properties and method for producing the same. The polymeric material of the invention includes an epoxy resin, a curing agent and a modification agent. Particularly, the modification agent is a derivative of 9,10-Dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO). Moreover, the curing agent is 4,4′-diaminodiphenyl methane (DDM), or tris(4-aminophenyl)amine (NNH).
摘要:
This invention provides one-pot reaction for digesting polycarbonate waste with alkylene glycol in the presence of a basic catalyst at 180° C. under normal atmospheric pressure. The digested product mixture was found to consist of bisphenol A (BPA) and monoalkoxylated and bisalkoxylated diols of BPA. Alkoxylation of BPA and monoalkoxylated diols of BPA is performed by adding urea or urea derivative (or carbonic acid ester or amine ester) to the digested product mixture at a high temperature under normal atmospheric pressure to obtain the final product, i.e., bisalkoxylated diols of BPA in high yield. The bisalkoxylated diols of BPA may be used as raw materials to synthesize polymer such as polyurethane (PU) or polyester.
摘要:
Disclosed is a process for synthesizing an aryl N-acylurea in both high selectivity and high yield, comprising reacting an aryl carbodiimide with a carboxylic acid under mild conditions. Thermolysis of N-acylureas at above about 120° C. gives amides and isocyanates, and the latter will undergo the repetitive reaction sequences in the presence of a carbodiimide catalyst. Based on this unique model, a sequential self-repetitive reaction (SSRR) is also developed in a versatile manner for converting aryl carbodiimides into amides, polyamides, polyamide-imides and polyamide-imide elastomers.
摘要:
Disclosed are rigid polyurethane-polyisocyanurate foams prepared from polyisocyanates, polyols, trimer catalysts and a blowing agent mixture comprising (i) a halocarbon, and (ii) an organic carboxylic acid, and, optionally water.The foams have excellent aged K-factor values at fluorocarbon levels reduced by up to 75 percent over prior art materials.
摘要:
Nitro-isopropenyldiphenyl ethers are provided which can serve as a useful source of known monomer intermediates or as intermediates for the preparation of nitro-haloisopropyl substituted diphenyl ethers. The latter have been discovered to act as facile alkylating agents with phenols providing nitro-p-hydroxyphenylisopropyl substituted diphenyl ethers. When the latter compounds are reduced there are obtained the corresponding amino-p-hydroxyphenylisopropyl substituted diphenyl ethers.The polymerization of this last class of compounds with acid halides provides polyamide-esters. The polymers can be used in the manufacture of such articles as tubing, hose, bellows hose, and the like.
摘要:
Novel isocyanato-azetidinedione compounds are provided which have the formula ##STR1## wherein R and R.sub.1 can be independently selected from hydrogen and hydrocarbyl or can be joined together and along with the carbon to which they are attached represent a cycloalkane residue having 4 to 6 ring carbon atoms, y is an integer from 1 to 7 and X is a hydrocarbon radical having a valency of y plus one.The monoisocyanate compounds are used as intermediates to provide further novel azetidinedione containing derivatives in the form of azetidinedione-isocyanurates (II) and azetidinedione-urethanes (III).All three classes of compounds can be employed as acid scavenging agents for stabilizing various kinds of halogenated polymer systems. Notably, (I) and (III) form highly useful polyamide-polyureas and polyamide-polyurethanes respectively by reaction with organic polyamines.
摘要:
Novel polyamide block copolymers are provided which comprise a central block of a soft segment derived from the residue of a polymeric polyol or polyamine joined to terminal hard segment polyamide blocks. The linkages which join the blocks are of a novel type and are the opened form of certain bis azetidine-2,4-dione rings.The block copolymers can be prepared very rapidly via anionically polymerizing lactams on to prepolymer soft segments containing terminal azetidine-2,4-dione rings.The speed with which the polymerizations can be carried out make the block copolymers particularly useful for the RIM preparation of molded parts.