Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB732763A
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WR Grace and Co
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WR Grace and Co
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Publication date
Application filed by WR Grace and CofiledCriticalWR Grace and Co
Publication of GB1019165ApublicationCriticalpatent/GB1019165A/en
C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
C08G2/02—Polymerisation initiated by wave energy or by particle radiation
C—CHEMISTRY; METALLURGY
C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
C08G2/00—Addition polymers of aldehydes or cyclic oligomers thereof or of ketones; Addition copolymers thereof with less than 50 molar percent of other substances
C08G2/10—Polymerisation of cyclic oligomers of formaldehyde
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Chemical & Material Sciences
(AREA)
Health & Medical Sciences
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Chemical Kinetics & Catalysis
(AREA)
Medicinal Chemistry
(AREA)
Polymers & Plastics
(AREA)
Organic Chemistry
(AREA)
Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds
(AREA)
Abstract
Trioxane is irradiated with high energy radiation and polymerized at above 30 DEG C., the trioxane and the polymer being maintained in a solid particulate state throughout and the trioxane used having a preselected range of particle size whereby the molecular weight of the polyoxymethylene produced is predetermined. The polymer produced may be graded to preselected ranges of particle size whereby polyoxymethylene having different ranges of molecular weight are produced. The particle sizes may be within the range 0.01 to 1000 microns, the irradiation may be effected at below polymerization temperature using e.g. a dose up to megarads and the polymerization carried out at 55 DEG to 62 DEG C.
GB732763A1962-05-291963-02-22Improvements in the production of polyoxymethylenes
ExpiredGB1019165A
(en)
PROCEDURE FOR CURING A POLYMERIZABLE COMPOSITION INCLUDING A ETHENIC UNSATURED, RENEWABLE POLYESTER, A THERMOPLAST POLYMER AND A ETHENIC UNSATURATED MONOMER AND A FIBER-REFERENCE MATERIAL
Some results of an experimental study of the protective properties of materials with respect to high-energy protons(High energy protons in synchrocyclotron testing of polyethylene, aluminum, lead and titanium hydride materials)
High-intensity(10-16) GeV/c negative particle beam(High intensity, negative particle beam with particle momentum of 10 to 16 GeV/c, produced by proton irradiation)
Certain aspects of nucleon isobar production in nucleon interactions at energies 10 super 3 and 25 Gev(Nucleon isobar production in photoemulsion giving rise to large energy transfer to several secondary charged particles)
Energy dependence of the O 16/He 3, He 3/O 16 and the O 16/He 3, alpha/O 15 angular distributions in the range 9. 8 to 11. 7 MeV(Energy-dependence of O/He 3/He/O and O/He/alpha/O angular distributions in 9. 8 to 11. 7 MeV)
Analysis of pi minus plus p yields pi minus plus pi plus plus n and pi minus plus p yields pi plus p 10 plus p reactions at the pi minus kinetic energy of 338 MeV(Negative pion-proton nuclear reaction)
Angular and energy distributions of particles produced in the inelastic pion-nucleon and nucleon-nucleon collisions at superhigh energies(Angular energy distribution of particles produced in inelastic pion-nucleon and nucleon-nucleon collisions at superhigh energies)