Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/18—Plasticising macromolecular compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/005—Processes for mixing polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
  • C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
  • C08J3/11—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids from solid polymers

Definitions

• fluent pastes with as small as possible quantities of liquid as plasticisers can be obtained by using for the production of the paste synthetic material powder containing larger quantities of larger particles of synthetic material and smaller quantities f smaller particles of synthetic materiaLwhilst substantially excluding the intermediate particles of intermediate size.
• the synthetic material mixture contains a gap in the distribution of particle sizes. i. e. particles of intermediate grain size are substantially absent between the larger and the smaller particle sizes.
• This special novel particle distribution gives a fluent paste even with relatively small quantities of liquid, whereas the usual mixture of grains, containing grains of intermediate size, gives a non-fluent stiff paste with the same liquid content which cannot readily be worked up.
• the synthetic material powders according to the invention may consist of particles of sizes less than /1000 mm. up to 0.5 mm. and more. For example 1 part by weight of polymethylmethacrylate pearls with a particle size of 0.250
• a polyvinyl chloride powder with particles of 9 to 15 microns does not give a suspension with equal parts of dibutylphthalate, but only mixtures of muddyconsistency; if, however, 20 to of the polyvinyl chloride particles of 9 to 15 microns are replaced by particles of 0.4 to 1.5 microns, then a liquid suspension is obtained similar to a painting lacquer. It had hitherto been assumed that good paste-forming powers depended more or less on the degree of polymerisation and on the manner in which the polymer was isolated. This is not, however, of primary importance; according to the present invention pasteforming power is primarily a function of the fineness of the grain composition of the synthetic material powder.
• the paste is produced by mixing or triturating the powder with the liquid plasticiser at low temperatures for example at room temperature, until a uniform suspension is produced, and the fractions of the powder of different granular sizes can be added to the liquid one after the other or as a mixture.
• the granular distribution follows the following rules:
• the powder is produced from two granular sizes, the ratio of the mean particle size of which is 1:6 or more.
• Granular sizes between these proportions should be kept as small as possible, i. e. there should be as few particles as possible having a granular size of between 1.1 times and 5.9 times the size of the smaller grains.
• the proportion by weight of larger grains should amount to 0.8 times to 5 times the weight of the smaller grains.
• each one of the above-mentioned granular sizes requires at least 1.2 parts of liquid for 1.0 part of powder to produce a liquid suspension as do mixtures of (a) with (b) or (c) with (d).
• a powder for the production of pastes of thermoplastic polymeric material for thermoplastic working up consisting essentially of a mixture of coarse grained and fine grained powder of the polymeric material the coarse grains having a diameter at least six times the diameter of the fine grains, and the ratio of the weight of the coarse grains to the weight of the fine grains being between 8:10 and :15, said powder mixture being substantially devoid of grains sized between the coarse and fine grain sizes.
• thermoplastic working up consisting of a powdery mixture of coarse and fine grained thermoplastic polymeric material
• the coarse grains having a diameter at least six times the diameter of the fine grains, and the ratio of the weight of the coarse grains to the weight of the fine grains being between 8:10 and 85:15, said powder mixture being substantially devoid of grains sized between the coarse and fine grain sizes, and a sufiicient quantity of liquid plasticiZer to convert said powder mixture into a fluent paste.
• thermoplastic polymeric material is a polyvinyl resin.
• thermoplastic polymeric material is polyvinyl chloride.
• thermoplastic material is an acrylic resin
• thermoplastic material is a polym-ethacrylate and said plasticizer is a monomeric methacrylate.
• a paste according to claim '2 in which the diameter of the coarse grains is less than 0.1 mm.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Processes Of Treating Macromolecular Substances (AREA)
• Paints Or Removers (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=4527662

Family Applications (1)

Country Status (7)

Cited By (9)

Families Citing this family (4)

Family Cites Families (2)

• 0
  • BE BE489599D patent/BE489599A/xx unknown
  • NL NL72985D patent/NL72985C/xx active
  • NL NL686811781A patent/NL146908B/xx unknown
• 1948
  • 1948-06-14 CH CH272263D patent/CH272263A/de unknown
• 1949
  • 1949-05-19 GB GB13440/49A patent/GB671045A/en not_active Expired
  • 1949-05-21 DE DEP43422A patent/DE934498C/de not_active Expired
  • 1949-06-01 US US96616A patent/US2553916A/en not_active Expired - Lifetime
  • 1949-06-08 FR FR987880D patent/FR987880A/fr not_active Expired

Non-Patent Citations (1)

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