Ciba-geigy Corporation

Hexcel Corporation

Ciba Specialty Chemicals Corporation

George E Green

Edward Irving

Bernard Peter Stark

John S Waterhouse

Ewald Losert

Abdul-Cader Zahir

John G Paul

John Cook

Heinz Abel

Hans Zweifel

John Leslie Cawse

Bryan Dobinson

Melvin Harris

Kenneth Winterbottom

Graham Kemp

F Dana Blair

Terrence Charles Webb

James Leonard Greig

Structurally strong composite sandwich panels are made using phenolic resin adhesives to bond the face sheets to the honeycomb. Certain configurations and combinations of phenolic resins and fire protection agents were found to provide low flame, smoke and toxicity (FST) panels which have high structural strength.

Fire resistant composite panel

A method of producing a curable prepreg which comprises (i) sandwiching a multi-ply fabric layer comprising at least two superposed sheets of woven reinforcing fabric between solid films of a curable resin composition and (ii) heating the resulting sandwich under pressure so that the resin composition impregnates the sheets of woven reinforcing fabric to form a coherent curable structure.

Fibre reinforced resin composite products

An improved honeycomb structure formed from a non-woven sheet material coated with a resin which contains particles of a polymeric material. The inclusion of solid polymeric particles in the resin coating was found to increase the strength and stiffness of the honeycomb without degrading compressive properties. Composite panels are also disclosed where the improved honeycomb structure is combined with one or more facing sheets.

Particulate reinforcement for honeycomb core materials

A process for bonding surfaces together comprises

Bonding method employing film adhesives

Acrylate-containing compositions and their polymerization

In a three stage process, a layer of a liquid composition containing a compound (A) having in the same molecule at least one (meth)acryloyl group and at least one 2,3-disubstituted maleimido group is exposed to actinic radiation so that the layer solidifies due to photopolymerization of (A) through the (meth)acryloyl group(s), remaining, however, further photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the disubstituted maleimido group(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include N-(2-(acryloyloxy)ethyl)-2,3-dimethylmaleimide and N-(3-(methacryloyloxy)-2-hydroxypropyl)-2,3-dimethylmaleimide.

Photopolymerization process employing compounds containing acryloyl

In a three stage process, a layer of a liquid composition containing a compound (A) having in the same molecule both at least one (meth)acryloyl group and at least one anthryl group is exposed to actinic radiation so that the layer solidifies due to photopolymerization of (A) through the (meth)acryloyl group(s), remaining, however, further photocrosslinkable. When desired, the solidified layer is exposed, as through a negative, to a substantially greater amount of actinic radiation, the parts so further exposed becoming more highly photocrosslinked through the anthryl group(s) and hence insoluble. An image is produced which can be developed by means of suitable solvents. Examples of (A) include 3-(acryloyloxy)-2-hydroxypropyl anthracene-9-carboxylate and its methacryloyl homologue.

New aromatic sulfonylsulfoxonium salts are of formula ##STR1## where q is 1 to 4,

Sulfoxonium salts and their use as polymerization catalysts

Substances (I) capable of being converted into higher-molecular weight materials under the influence of a cationic catalyst, such as 1,2-epoxides, aminoplasts, vinyl monomers and prepolymers, or phenoplasts, are so converted by exposure to actinic radiation in the presence of an aryl- or aroyl- carbamoylsulfoxonium salt (II) of formula ##STR1## where p is zero or 1,

Photopolymerization by means of sulfoxonium salts

A method for forming an image by a positive resist process comprises:

Image formation process

Substances (I) capable of being converted into higher-molecular weight materials under the influence of a cationic catalyst, such as 1,2-epoxides, aminoplasts, vinyl monomers or prepolymers, or phenoplasts, are so converted by exposure to actinic radiation in the presence of a sulphoxonium salt (II) of formula ##STR1## where P denotes zero or 1,

Photopolymerization by means of sulphoxonium salts

Hydroxyl-containing compositions and their polymerization

Substances (I) capable of being converted into higher-molecular weight materials under the influence of a cationic catalyst, such as 1,2-epoxides, aminoplasts, vinyl monomers or prepolymers, or phenoplasts, are so converted by exposure to actinic irradiation or by heating in the presence of an aryloxysulfoxonium salt of formula ##STR1## where either R.sup.6 and R.sup.7 separately denote lower alkyl (optionally substituted by halogen and interrupted in the chain by --O-- or --SO.sub.2 --), or an aryl or aryloxy group, or R.sup.6 and R.sup.7 together denote a divalent group forming with the S atom a heterocyclic radical; R.sup.8 denotes an aryl group; M denotes an atom of a metal or metalloid; X denotes a halogen atom; and n is 4, 5, or 6, for instance,

Photopolymerizable and thermally polymerizable compositions

Diglycidyl unsaturated ketones of formula ##STR1## e.g., 1,5-bis(p-glycidyloxyphenyl)-1,4-pentadien-3-one, are prepared by condensing one molar equivalent of a ketone of formula

Growing community of inventors

Stapleford, United Kingdom

George E Green