GB862361A - Improvements in or relating to polyurethane foams - Google Patents

Improvements in or relating to polyurethane foams

Info

Publication number
GB862361A
GB862361A GB3929559A GB3929559A GB862361A GB 862361 A GB862361 A GB 862361A GB 3929559 A GB3929559 A GB 3929559A GB 3929559 A GB3929559 A GB 3929559A GB 862361 A GB862361 A GB 862361A
Authority
GB
United Kingdom
Prior art keywords
siloxanes
siloxane units
dimethylsiloxane
moulding
mould
Prior art date
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
GB3929559A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midland Silicones Ltd
Original Assignee
Midland Silicones Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Midland Silicones Ltd filed Critical Midland Silicones Ltd
Publication of GB862361A publication Critical patent/GB862361A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/005—Avoiding skin formation; Making foams with porous surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B29C33/64—Silicone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A mould release agent for use in the moulding of polyurethane foams comprises a dimethylpolysiloxane which may contain a minor proportion of methylphenyl-, diphenyl-, phenylethyl-, methylvinyl- or diethyl-siloxane units, which is coated on the surface of the mould and cured in situ at room or elevated temperature by means of (a) cross-linking agents, e.g. methyl hydrogen siloxanes, alkyl silicates and polysilicates, together with metal carboxylates; (b) siloxanes containing SiH groups and chloroplatinic acid, where the dimethylsiloxane contains Si-bonded vinyl radicals; (c) atmospheric moisture, where the Si-OH groups. in the dimethylsiloxane have been replaced by acetoxy groups; and (d) organic peroxides and heating to above 110 DEG C. U.S.A. Specification 2,811,408 is referred to.ALSO:A mould release agent for use in the moulding of polyurethane foams comprises a dimethyl-polysiloxane which is formed on the moulding surfaces as a cured film. The term "dimethyl-polysiloxane" includes siloxanes in which all the units are of the formula (CH3)2SiO and those diorganosiloxanes in which a major proportion of the siloxane units are of this formula, the remainder being phenyl or lower aliphatic siloxane units. The presence of any appreciable amounts of triorgano-siloxane units is excluded. Thus the term includes copolymers of dimethylsiloxane with phenylmethylsiloxane, diphenylsiloxane, phenylethylsiloxane, methylvinylsiloxane, or diethylsiloxane. The siloxane can be applied to the mould surface by any convenient method such as by spraying, dipping or brushing, and it can be employed either per se or in solution or emulsion form. Relatively small amounts of the siloxanes are required, e.g. a dispersion containing 5% by weight gives good results. Any convenient method of curing may be employed. U.S.A. Specification 2,811,408 is referred to.
GB3929559A 1959-02-09 1959-11-19 Improvements in or relating to polyurethane foams Expired GB862361A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79183459A 1959-02-09 1959-02-09

Publications (1)

Publication Number Publication Date
GB862361A true GB862361A (en) 1961-03-08

Family

ID=25154927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3929559A Expired GB862361A (en) 1959-02-09 1959-11-19 Improvements in or relating to polyurethane foams

Country Status (3)

Country Link
DE (1) DE1191559B (en)
FR (1) FR1245168A (en)
GB (1) GB862361A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1235574B (en) * 1962-06-30 1967-03-02 Continental Gummi Werke Ag Process for the production of molded bodies from polyurethane foam plastics with an open-pored surface

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3418089A1 (en) * 1984-05-16 1985-11-21 Bayer Ag, 5090 Leverkusen Release agent for polyurethane casting compounds and polyurethane elastomers
DE3821908A1 (en) * 1988-06-29 1990-01-04 Ernst Boettler Kg Bomix Chemie Release agent

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB632586A (en) * 1946-02-07 1949-11-28 Dow Chemical Co Improvements in the molding of organic plastic materials
US2573337A (en) * 1948-02-16 1951-10-30 Corning Glass Works Coated metal mold for blowing glass and method of preparing the same
US2811408A (en) * 1954-11-19 1957-10-29 Dow Corning Method of molding plastic articles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1235574B (en) * 1962-06-30 1967-03-02 Continental Gummi Werke Ag Process for the production of molded bodies from polyurethane foam plastics with an open-pored surface

Also Published As

Publication number Publication date
FR1245168A (en) 1960-11-04
DE1191559B (en) 1965-04-22

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