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Method for making trans non-conjugated diolefins
130
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/ Journal
c?f Fluoritle
bromine to obtain 2,2-bis (5-amino-4,6-benzothiazolyl)hexafluoropropane, which is allowed to further react successively with potassium hydroxide and hydrochloric acid t 0 obtain 2,2-bis(4-amino-3-mercaptophenyl)hexafluoropr opane, which is a novel compound applicable as a curing agent for a fluorine-containing elastomer having CN groups as cross-linkable groups.
5668251 PREPARATION OF CO-PREPOLYMERS FROM MONO-SUBSTITUTED FLUORINATED MONOMERS AND TETRAHYDROFURAN
Chemisty
87 (I 998)
123-132
hydrocarbon compatibility. These prepolymers are polydisperse and exhibit number average molecular weights from 5,000 to about 50,000. These prepolymers are amorphous oils with primary hydroxy end-groups and thus function efficiently as the soft block for the synthesis of a variety of thermosetithermoplastic elastomers and plastics having the characteristics of very low surface energy, high hydrophobicity, low glasss transition temperature and low coefficient of friction. The polyurethanes derived from the prepolymers of this invention are elastomeric and, in addition to the above characteristics, exhibit high moisture resistance, high tear strength and excellent adhesion to a variety of substrates.
Malik Aslam A; Carlson Roland P Cameron Park, UNITED STATES assigned to CA Aerojet-General Corporation This application is directed to novel fluorinated polymers and prepolymers derived from mono-substituted oxetane monomers having fluorinated alkoxymethylene side-chains and the method of making these compositions. The mono-substituted fluorinated oxetane monomers having fluorinated alkoxymethylene side-chains are prepared in high yield by the reaction of a fluorinated alkoxides with either 3-halomethyl-3-methyloxetane premonomers or derivative of aryl sulfonate 3-hydroxymethyl-3-methyloxetane premonomers. Preparation of a mono-substituted 3-bromomethyl-3-methyloxetane premonomer via a simple, high yield process amenable to commercial scaleup is also disclosed. The fluorinated oxetane monomers of this invention can be readily home/co-polymerized in the presence of a Lewis acid and polyhydroxy compounds to obtain hydroxy-terminated polyether prepolymers having fluorinated alkoxymethylene side chains. Additionally, the fluorinated oxetane monomers can be copolymerized with non-fluorinated monomers such as tetrahydrofuran to give polyether prepolymers with improved
5672803 METHOD FOR MAKING TRANS NON-CONJUGATED DIOLEFINS Smith Robert Scott; Wristers Jos Peter Houston, TX, UNITED STATES assigned to Exxon Chemical Patents Inc A method is provided for selectively producing a trans-geometrical isomer of non-conjugated diolefins. The method comprises treating a starting non-conjugated diolefin isomer or mixture of isomers, a first mono-olefin and a second mono-olefin with a metathesis catalyst under selected reaction conditions to produce a product with greater than 80% trans-geometrical isomer content. In a preferred embodiment, 1,4-hexadiene, ethene, and propene contact a Re207 catalyst and are converted to a reaction product mixture with above 80% trans- 1,4-hexadiene.
PG tents Alert
/ Journal
c?f Fluoritle
bromine to obtain 2,2-bis (5-amino-4,6-benzothiazolyl)hexafluoropropane, which is allowed to further react successively with potassium hydroxide and hydrochloric acid t 0 obtain 2,2-bis(4-amino-3-mercaptophenyl)hexafluoropr opane, which is a novel compound applicable as a curing agent for a fluorine-containing elastomer having CN groups as cross-linkable groups.
5668251 PREPARATION OF CO-PREPOLYMERS FROM MONO-SUBSTITUTED FLUORINATED MONOMERS AND TETRAHYDROFURAN
Chemisty
87 (I 998)
123-132
hydrocarbon compatibility. These prepolymers are polydisperse and exhibit number average molecular weights from 5,000 to about 50,000. These prepolymers are amorphous oils with primary hydroxy end-groups and thus function efficiently as the soft block for the synthesis of a variety of thermosetithermoplastic elastomers and plastics having the characteristics of very low surface energy, high hydrophobicity, low glasss transition temperature and low coefficient of friction. The polyurethanes derived from the prepolymers of this invention are elastomeric and, in addition to the above characteristics, exhibit high moisture resistance, high tear strength and excellent adhesion to a variety of substrates.
Malik Aslam A; Carlson Roland P Cameron Park, UNITED STATES assigned to CA Aerojet-General Corporation This application is directed to novel fluorinated polymers and prepolymers derived from mono-substituted oxetane monomers having fluorinated alkoxymethylene side-chains and the method of making these compositions. The mono-substituted fluorinated oxetane monomers having fluorinated alkoxymethylene side-chains are prepared in high yield by the reaction of a fluorinated alkoxides with either 3-halomethyl-3-methyloxetane premonomers or derivative of aryl sulfonate 3-hydroxymethyl-3-methyloxetane premonomers. Preparation of a mono-substituted 3-bromomethyl-3-methyloxetane premonomer via a simple, high yield process amenable to commercial scaleup is also disclosed. The fluorinated oxetane monomers of this invention can be readily home/co-polymerized in the presence of a Lewis acid and polyhydroxy compounds to obtain hydroxy-terminated polyether prepolymers having fluorinated alkoxymethylene side chains. Additionally, the fluorinated oxetane monomers can be copolymerized with non-fluorinated monomers such as tetrahydrofuran to give polyether prepolymers with improved
5672803 METHOD FOR MAKING TRANS NON-CONJUGATED DIOLEFINS Smith Robert Scott; Wristers Jos Peter Houston, TX, UNITED STATES assigned to Exxon Chemical Patents Inc A method is provided for selectively producing a trans-geometrical isomer of non-conjugated diolefins. The method comprises treating a starting non-conjugated diolefin isomer or mixture of isomers, a first mono-olefin and a second mono-olefin with a metathesis catalyst under selected reaction conditions to produce a product with greater than 80% trans-geometrical isomer content. In a preferred embodiment, 1,4-hexadiene, ethene, and propene contact a Re207 catalyst and are converted to a reaction product mixture with above 80% trans- 1,4-hexadiene.