摘要:
A two-component bonding agent composition. The composition contains: (a) an isocyanate component comprising a difunctional isocyanate-terminated prepolymer having polymerized residues of at least one difunctional aromatic isocyanate and at least one difunctional polymer of ethylene oxide, propylene oxide or a combination thereof; (b) a polyol component comprising a triglyceride having hydroxyl functional groups; and (c) an adhesion promoter.
摘要:
A predetermined pattern of a dielectric polymer is formed on a substrate from a prepolymer which is an ether of the oligomeric condensation product of a dihydric phenol and formaldehyde having the formula ##STR1##
摘要:
A class of di-ortho-substituted bismaleimides undergo uncatalyzed Michael addition with polyhydric phenols to afford chain-extended bismaleimides having a significantly wider processing window than the non-extended parent. The fully cured resins show improved fracture toughness, generally have comparable or superior dielectric constant and dielectric loss, and show no degradation in other properties such as resistance to moisture, to methylene chloride, and coefficient of thermal expansion.
摘要:
A predetermined pattern of a dielectric polymer is formed on a substrate from a prepolymer which is an ether of the reaction product of a dicyclopentadiene and a phenol.
摘要:
Chlorine-resistant semipermeable membranes which comprise an interfacial polymerized reaction product composited on a porous support backing material may be prepared by contacting a porous support material such as polysulfone with an aqueous solution of an aromatic polyamine containing a chlorine substituent on the aromatic ring such as 5-chlor-m-phenylenediamine. The coated support material is then contacted with an organic solvent solution of aromatic polycarboxylic acid chloride such as trimesoyl chloride for a period of time sufficient to form an interfacial polymerized reaction product on the surface of the support material. The resultant semipermeable membrane is then cured at curing conditions to form the desired composite. The resultant membrane composite may be used in separation processes such as desalination of brackish or sea water, the membrane being resistant to attack by chlorine which is present in the water.
摘要:
Thermosetting resins which are essentially vinylbenzyl end-capped ethers of the oligomeric condensation products of certain dihydric phenols and formaldehyde are readily polymerized to give an extensively cross-linked polymer particularly useful in printed circuit boards and similar laminates. Effective cost reduction may be enjoyed by replacing up to 50% of the vinylbenzyl moieties by other groups, such as alkyl and benzyl groups, without destroying the usefulness of the resulting thermosetting resins. The vinylbenzyl ether product from bisphenol-A is especially recommended.
摘要:
Facilitated gas enrichment membrane composites which are utilized in the separation of gases or gas enrichment of a gas mixture will comprise an organometallic compound which acts as a gas carrier interdispersed in an interpenetrating polymer network matrix. The network matrix which comprises the reaction product of an isocyanate-capped polymer physically entwined with a nitrogen-containing compound will be nonacidic and hydrophobic in nature.
摘要:
A modified natural oil made from reacting at least one natural oil or fat comprising at least one ene moiety with at least one of an enophile or dienophile mixture to form at least one modified natural oil, and reacting the at least one modified natural oil which may be used in a variety of processes.
摘要:
Epoxy resin compositions used in preparation of laminates for electronic applications are free of the solvents typically needed in current industrial practice. The use of certain mono-substituted dicyandiamides makes possible the elimination of such solvents since all of the components are soluble in epoxy resin to an extent which provides uniform properties in the cured laminates.
摘要:
This invention relates to an improved, high-yield process for producing cyclic siloxane in a biphasic reaction solvent mixture comprising an alkane, an alcohol and water.