Publication Date: 2007-Feb-12
The IP.com Prior Art Database
Eastman Chemical Company: OWNER [+3]
A composition comprising a peroxide and diluent or carrier having the general formula: R1OOC-C6-COOR2
A composition comprising a peroxide and diluent or carrier having the general formula:
wherein R1 and R2 are independently selected from the group consisting of saturated, straight or branched unsubstituted alkyl, or cycloalkly groups having from 4 to 8 carbon atoms. Suitable peroxides are selected from dialkyl peroxides, diacyl peroxides, hyperoxides, ketone peroxides, peroxycarbonates, peroxyesters, peroxyketals.
Peroxides are commercially accepted and used for a wide variety of uses, such as curing agents for sealants, elastomers, thermoplastics, reaction initiators for vinyl polymers, cross-linking agents, bleaching agents, and the like. Examples of such peroxides include dialkyl peroxides, diacyl peroxides, hyperoxides, ketone peroxides, peroxycarbonates, peroxyesters, peroxyketals.
Diaroyl peroxides and particularly dibenzoyl peroxide are hazardous in the dry crystalline form and therefore require a phlegmatizer or desensitizer to facilitate their safe handling. While solid diluents are used in a few applications diaroyl peroxides are commonly formulated as a paste or as a liquid suspension in order to facilitate their use and make them commercially acceptable.
A range of carriers or diluents have been employed in preparing peroxide compositions. One of the earliest was tricresyl phosphate which still is very useful for a few applications but has been replaced in most uses. Carriers which are most commonly used are esters of ortho-phthalic acid such as butyl benzyl phthalate, dibutyl phthalate and diisobutyl phthalate. Benzoates of glycols particularly dipropylene glycol dibenzoate have
also been employed. As used herein the terms "carrier" and "diluent" are used interchangeably.
The diaroyl peroxides such as benzoyl peroxide when manufactured, are small granules which are agglomerates of many very fine crystals. An important property in the selection of a carrier for an aroyl peroxide composition is that it softens the granules so that
they disperse or break down readily into the individual crystals in the vehicle when mixed. This eliminates the necessity of milling the composition in order to reduce particle size to make them economically acceptable. Thus one of the requirements of a suitable carrier or diluent is that it softens or disperses the granules readily. Another requirement is that the aroyl peroxide be sufficiently stable when in contact with the carrier over the temperature
range normally encountered in commercial applications, shipping and use to prevent gassing, loss of activity during storage and shipping and minimization of any potential for an exothermic self accelerating decomposition.
Diaroyl peroxides, of which dibenzoyl peroxide is a primary ex...