摘要:
A mixture consisting of a polymaleimide and a copolymerizable monomer or a prepolymer formed from these two compounds contains, as the polymerization catalyst, an ethane which is substituted by aromatic groups and hydroxyl groups or halogen (cf. formula II), such as benzpinacol. The mixture is stable on storage and heat-curable. It can be cured, while at the same time being shaped to give mouldings, sheet-like structures, laminates, adhesive bonds or foams, for example by casting or compression moulding.
摘要:
The invention relates to storage-stable, thermosetting mixtures which contain polymaleimides, epoxide compounds having at least one allyl group, and optionally, curing agents for epoxide compounds, and/or curing accelerators for epoxide resin mixtures. These mixtures can be converted by curing into high-polymers which have excellent electrical properties (especially at high temperatures) and very good thermal properties.
摘要:
Compounds of formula I or II ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen, alkyl, cyclohexyl, phenyl, benzyl or tolyl, or are a --CH.sub.2 --CHR.sup.3 --CH.sub.2 --S--CO--R.sup.4 radical, R.sup.3 is hydrogen or methyl, R.varies.is alkyl, cyclohexyl, phenyl, benzyl or tolyl, X is alkylene, --S--, --SO--, --SO.sub.2 -- or substituted alkylene, in which R.sup.5 and R.sup.6 are hydrogen or alkyl, and n is an integer from 1 to 10, can be used as latent hardeners for epoxy resins.The compositions containing epoxy resins and these hardeners are particularly suitable for use as single component adhesive formulations. The cured products have good hot water resistance.
摘要:
Polymerizable compositions comprise(a) a compound containing in the same molecule both at least one phenolic hydroxyl group and at least two groups chosen from allyl, methallyl, and 1-propenyl groups, e.g., 2,2-bis(3-allyl-4-hydroxyphenyl)propane or bis(3-(1-propenyl)-4-hydroxyphenyl)methane,(b) a compound containing at least two mercaptan groups per molecule, e.g., pentaerythritol tetrathioglycollate, and(c) a heat-activated crosslinking agent for phenol-aldehyde novolac resins.The compositions are caused to polymerize by the action of irradiation of free-radical catalysts. The polymers so obtained, containing more than one phenolic hydroxyl group, can be subsequently crosslinked in situ by heating. The compositions are useful in various two-stage operations, such as the production of multilayer printed circuits.Polymerizable compositions may also comprise(d) a compound as (a) but containing at least two phenolic hydroxyl groups,(e) a compound containing more than two mercaptan groups per molecule.On irradiation or on heating in the presence of a catalyst, preferably a free-radical catalyst, these compositions crosslink, they are useful as adhesives in forming coatings on polar substrates.
摘要:
The invention relates to solutions which are stable on storage and which contain curable mixtures of polymaleimides, comonomers for these polymaleimides and, optionally, polymerization catalysts and compounds which contain at least one furyl radical, preferably furfuryl alcohol. The solutions are used for the manufacture of crosslinked polymers containing imide groups. Usually a substrate is impregnated with the solution. After drying, curing is carried out at 100 to 300.degree. C. Using a known method, for example, glass fibre fabric is subjected to hot pressing together with a copper foil, curing being effected. This gives correspondingly copper-coated laminated sheets which are outstandingly suitable for the manufacture of printed circuits.
摘要:
Compounds of formula I or II ##STR1## wherein R.sup.1 and R.sup.2 are hydrogen, alkyl, cyclohexyl, phenyl, benzyl or tolyl, or are a --CH.sub.2 --CHR.sup.3 --CH.sub.2 --S--CO--R.sup.4 radical, R.sup.3 is hydrogen or methyl, R.sup.4 is alkyl, cyclohexyl, phenyl, benzyl or tolyl, X is alkylene, --S--, --SO--, --SO.sub.2 -- or substituted alkylene, in which R.sup.5 and R.sup.6 are hydrogen or alkyl, and n is an integer from 1 to 10, can be used as latent hardeners for epoxy resins.The compositions containing epoxy resins and these hardeners are particularly suitable for use as single component adhesive formulations. The cured products have good hot water resistance.
摘要:
Triglycidyl compounds of the formula I ##STR1## and epoxy resin mixtures containing a triglycidyl compound of the formula I and a tetraglycidyl compound of the formula II ##STR2## in which formulae each of R and R' independently is a hydrogen atom, C.sub.1 -C.sub.6 alkyl, phenyl, cyclohexyl or cyclopentyl, and each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently is a hydrogen atom, a halogen atom, or C.sub.1 -C.sub.6 alkyl.Thses compounds are valuable epoxy resins which are also suitable for the preparation of B-stage resins.
摘要:
The invention relates to a polymerizable and self-crosslinkable composition of monomers having olefinic unsaturation and, if desired, conventional additives, said composition containing(a) 1 to 99.9% by weight of at least one ethylene or propylene monomer which is substituted by polar groups or aromatic hydrocarbon groups, and(b) 99 to 0.1% by weight of an acrylate or methacrylate of monohydric or dihydric, mononuclear or binuclear phenols which are substituted by allyl, methallyl or 1-propenyl groups, or hydroxyalkyl ethers thereof. The composition of the invention can be used as a casting or impregnating resin, adhesive, lacquer and binder, and it can be cured by irradiation and/or heat.
摘要:
Curable mixtures of(a) maleimides of the general formula I ##STR1## wherein R is an n-valent aliphatic or aromatic radical, and n is the number 1,2 or 3; and(b) mono- or polyvalent phenols which contain in the molecule at least one 1-propenyl group in the ortho- or para-position with respect to the hydroxyl group, or isomeric mixtures of mono- or polyvalent phenols which are propenyl-substituted in the ortho- or para-position and mono- or polyvalent phenols which are allyl-substituted in the ortho- or para-position, the proportion of propenyl groups in the isomeric mixture having to be at least 5 equivalent-%, relative to the sum of the equivalents of propenyl and allyl groups.The novel mixtures cure at elevated temperatures relatively rapidly, and produce moulded materials having valuable mechanical properties.
摘要:
Storage-stable heat-curable mixtures are described which contain(A) a polyimide which contains in the molecule at least two radicals of formula I ##STR1## wherein D is a divalent radical with a C.dbd.C double bond, (B) an alkenylphenol,(C) an epoxide group-free adduct of an epoxy resin with excess alkenylphenol or(D) a polyimide which is soluble in organic solvents or a mixture of (C) and (D).These mixtures are employed for example as laminating resins or electro-resins, as adhesives or adhesive films for application at high temperatures, or for the preparation of coatings.