摘要:
A process is provided whereby significantly improved drying rates are obtained in the production of raisins. The process involves treating the grapes with a hot aqueous solution containing a lower alkyl ester of a fatty acid and alkali metal carbonate prior to the drying operation.
摘要:
Mixed metal compounds comprised of aluminum alkoxides or aluminum carboxylates with an alkali metal or magnesium alkoxide or carboxylate are useful catalysts for the thermal depolymerization of polyesters to produce macrocyclic compounds. High yields and enhanced rates of reaction are possible utilizing these mixed metal catalysts in known depolymerization procedures.
摘要:
A process is provided whereby the malodorous and undesirable constituents present with macrocyclic fragrance compounds obtained by the thermal depolymerization of polyesters are removed. The process involves contacting the macrocyclic compound maintained in a liquid state with ozone or ozone and an aqueous solution of hydrogen peroxide.
摘要:
The invention relates to novel polyamides substantially based on polycarboxylic acids, in particular polymerized fatty acids, and polyalkylene polyamines in which the recurring alkylene groups are of different carbon chain lengths and two or more different alkylene imine groups occur. These polyamides show amine values from 5-600, acid values below 2 and viscosities of 0.05-25 Pa s and are useful as curing catalysts for epoxy resins.
摘要:
Polyamides and polyesters having greatly improved resistance to static electricity buildup are obtained by the incorporation of about 0.1 to 20 weight percent poly(alkylene ether) esters of polybasic acid. The antistatic properties of these polymers is significantly improved when poly(ethylene oxide) esters of dimer and trimer acids are employed.
摘要:
Amino-amides obtained by the reaction of polymeric fatty acids with poly(oxyethylene) diamines are readily compatible with water in all proportions and form clear, aqueous solutions which have excellent lubricating properties.
摘要:
The flow characteristics and rheological properties of thermoplastic polyesters and copolyesters are significantly improved by the addition of a polyamide resin thereto. In addition to improving the processability of the thermoplastic materials the polymeric additives also impart other desirable properties to the resulting manufactured products.
摘要:
High molecular weight carboxylic acids are provided. The mixed acid products of this invention typically contain a high percentage of aliphatic straight-chain monocarboxylic acids containing 22 or more carbon atoms. The monocarboxylic acids are obtained by the ozonization of high molecular weight .alpha.-olefins under controlled conditions. Using this ozonization process it is possible to obtain mixed acid products wherein the predominant acids contain 22 to 35 carbon atoms. An additional feature of this invention is the ability to obtain mixed acid products wherein acids having an odd number of carbon atoms are present in significantly larger amounts than acids having an even number of carbon atoms.
摘要:
Ester products are obtained using an immobilized supported transition metal catalyst. Esters and polyesters having improved color and containing virtually no residual metal catalyst can be obtained with this process either by direct esterification or by ester interchange.
摘要:
Soaps and ester-soaps of high molecular weight branched- and straight-chain aliphatic monocarboxyic acids obtained from .alpha.-olefins containing 22 or more carbon atoms are useful lubricants for structural resins. High molecular weight acids useful for the preparation of the soaps and ester-soaps are obtained by the free radical addition of a short chain monocarboxylic acid to C.sub.22.sub.+ olefin or by ozonization of the C.sub.22.sub.+ olefin. The products of this invention provide excellent internal-external lubrication for PVC homopolymers and copolymers.