摘要:
Epoxy compositions that exhibit low viscosity in the uncured state and low coefficient of thermal expansion in the cured state are provided. The compositions are well-suited for use as dielectrics in electronics applications such as in multi-layer printed circuit boards, integrated circuit (IC) chip substrates, also known as IC chip carriers, and IC chip package interposers.
摘要:
An epoxy resin composition is disclosed as containing, as essential components, an epoxy resin, an aryl ester compound obtained from a polyhydric phenol representedd by a formula (4) with a carbonyl compound represented by a general formula (2) and a cure accelerator. When cured, the resulting product has low dielectric constant and a low dielectric loss tangent. A copper-clad laminate formed using the described composition has a low dielectric constant and a low dielectric loss tangent. The copper-clad laminate exhibits excellent adhesiveness characteristics and is suitable for use in multilayer printed wiring boards in high speed operations, particularly in the high frequency region.
摘要:
A process for curing epoxidized diene polymers for use in adhesives, sealants, and coatings which comprises contacting the polymer with an aromatic anhydride curing agent at an epoxy/anhydride molar ratio from 0.5/1 to 2.0/1.0, optionally, and from 0.1 to 10 phr of an accelerator at a temperature of from 100 to for a period of 10 minutes to six hours.
摘要:
Rigid-rod macromonomers, and methods for preparing such macromonomers, having a polyaromatic backbone, solubilizing side groups, and reactive side groups are provided. The macromonomers are chemically incorporated into polymer systems to provide stronger, stiffened polymers.
摘要:
Aromatic trisanhydrides of the formula (I) ##STR1## wherein R is hydrogen, C.sub.1 -C.sub.4 alkyl or aryl are useful for the synthesis of star-branched and star-burst polyester-imides and polyesterimide-amides and as curing agents for epoxy resins, phenolics and polyesters.
摘要:
What is disclosed are thermosetting epoxy resin compositions containing block siloxane copolymers which are used to induce low internal stress in the cured compositions and to provide coefficients of thermal expansion more closely aligned with the coefficients of thermal expansion of the substrates being molded therewith.
摘要:
Powder useful for applying electrical-insulating coatings to wire, the powder being a blend of (a) polyglycidyl ether capped with monobasic aromatic acid such as benzoic acid and (b) trimellitic anhydride.
摘要:
A coating powder is disclosed which is prepared from a solventless non-aqueous composition of a solid epoxy resin having an epoxy equivalent weight of about 400 to about 8000, a Durran's softening point of at least 70.degree., a solid polyanhydride curing agent at least about 50 mole % of which is trimellitic anhydride, and a cross-linking agent having the general formula R.sub.3 SnX where each R is selected from alkyl, aryl, aralkyl, and alkaryl up to C.sub.20 and X is selected from acetate, propionate, butyrate, halogen, and hydroxyl. The composition is dry-blended and then melt-mixed at 50.degree. to 150.degree. C. To prepare the coating powder, it is then cooled, crushed, and ground to a particle size of less than 100 microns. The coating powder is electrostatically applied to a conductor and is cured above the melting point of the resin.
摘要:
Powder coating compositions comprise an epoxide resin and a carboxylic acid of formula ##STR1## where R.sup.1 represents a phenylene or naphthylene group or a group comprising 2 or 3 phenylene radicals linked by one or two carbon-carbon bonds, ether oxygen atoms, sulfur atoms, or sulfonyl, sulfoxide, carbonyl or alkylene groups,R.sup.2 represents a saturated alkyl group, a benzenoid group or an aralkyl group, andboth n are the same and represent zero or 1.
摘要:
The invention relates to new imidyl compounds of the formula Ia and isoimidyl compounds of the formula Ib ##STR1## IN WHICH A denotes a divalent organic radical, especially an ethenylene, ethylene or propylene group. These compounds serve as curing agents for epoxide resins and give cured products with good mechanical and electrical properties.