Exxon Research and Engineering Company

Other

Exxon Chemical Patents, Inc.

Alberto Malatesta

Francis P Baldwin

Charles P O'Farrell

Bernard Bossaert

Christian Pierre

Rene Cohard

Jacques Mourand

Size dispersion in paper stock is improved by treatment of cellulose water slurry with cationizing compounds and mixing a sizing product, either neat or in solution, with the water and injecting the mixture in droplet form into said cellulose water slurry before, during or after the paper web formation whether said paper web is dry or not and drying the paper web, an apparatus for carrying out the improved process is included.

Process for sizing paper and similar products

An improved method for making hydrogenated petroleum resins by subjecting the resin to hydrogenation in the presence of a sulfided nickel (2 to 10 wt. %)--tungsten (10 to 25 wt. %) catalyst supported on a gamma-alumina having fresh catalyst surface area ranging from 120 to 300 m.sup.2 /g under a hydrogen pressure of 150 to 200 atmospheres and at a temperature in the range 250.degree. C. to 330.degree. C. and the resins so produced.

Production of hydrofined hydrocarbon resins

Carboxyl modified petroleum resins suitable as resins in inks for off-set printing are obtained by heating cyclopentadiene or a comparable monomer with 1 to 15 wt. % of a carboxylic acid which is not .alpha.-.beta., unsaturated at from 270.degree. C. to 290.degree. under sufficient pressure to keep the mixture liquid.

Preparation of modified petroleum resins

A carboxyl modified, metal-free petroleum resin comprising a resin obtained by thermal polymerization of a feed containing cyclopentadiene and/or methylcyclopentadiene and/or their dimers or codimers having been reacted electrophilically with a saturated or ethylenically unsaturated higher fatty acid, said modified resin having an acid number less than 20, containing from 1 wt. % to 5 wt. % of oxygen and having a softening point of from 120.degree. C. to 200.degree. C. These resins may be prepared by heating a resin obtained by thermal polymerization of a feed containing the aforesaid cyclopentadiene and/or methylcyclopentadiene and/or derivatives thereof with said carboxylic acid to a temperature in the range of 200.degree. C. to 270.degree. C. and subsequently removing free acid to reduce the acid number to below 20.

Resins for printing inks

Disclosed is a method for crosslinking elastomers containing randomly distributed sites of conjugated olefinic unsaturation of which the crosslinks are comprised of chains of free radical polymerizable monomers.

Preparation of modified elastomers

A process for preparing latices in ionomeric form from copolymers of an isoolefin containing from 4 to 7 carbon atoms and a conjugated multiolefin containing from 4 to 14 carbon atoms, where a major portion of said conjugated multiolefin has conjugated diene unsaturation, is disclosed. The process principally comprises forming an adduct of conjugated diene butyl rubber with a dienophile capable of implanting carboxylic acid functionality on the polymer such as maleic anhydride, emulsifying the adduct thus formed, and neutralizing the resulting emulsion with a suitable base. Highly improved ionomeric latices are also disclosed, having an average particle size of less than about 1 micron, average solids contents easily adjusted from between about 5 to 70 weight percent solids, and having a pH, depending on the emulsifier used, of from 3 to 12. Films cast from these latices have an improved tensile at break of greater than about 2500 psi.

Latex from conjugated diene butyl rubber

Dehydrohalogenation of halogenated butyl to produce a butyl rubber having conjugated double bonds in the linear backbone. The composition is disclosed as having the predominant structure: ##EQU1## where n + 1 represent the number of isoolefin units incorporated in the butyl rubber polymer backbone, and m represents the number of conjugated diolefin units present, substantially as isolated units. The composition is prepared by contacting a solution of halogenated butyl rubber with: (1) a soluble metal carboxylate, where the metal is selected from the metals of Groups Ib, IIb, IVa and VIII of the Periodic Table; (2) a soluble carboxylic acid; and (3) an oxide or hydroxide of a metal selected from the metals of Groups Ia or IIa of the Periodic Table.

Growing community of inventors

Brussels, Belgium

Alberto Malatesta