GB2230013A - PVC moulding paste - Google Patents

PVC moulding paste Download PDF

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Publication number
GB2230013A
GB2230013A GB8907529A GB8907529A GB2230013A GB 2230013 A GB2230013 A GB 2230013A GB 8907529 A GB8907529 A GB 8907529A GB 8907529 A GB8907529 A GB 8907529A GB 2230013 A GB2230013 A GB 2230013A
Authority
GB
United Kingdom
Prior art keywords
paste
moulding
pvc
powdered slate
moulding paste
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.)
Granted
Application number
GB8907529A
Other versions
GB8907529D0 (en
GB2230013B (en
Inventor
William Ray Bossons
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.)
W H BOSSONS
Original Assignee
W H BOSSONS
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 W H BOSSONS filed Critical W H BOSSONS
Priority to GB8907529A priority Critical patent/GB2230013B/en
Publication of GB8907529D0 publication Critical patent/GB8907529D0/en
Publication of GB2230013A publication Critical patent/GB2230013A/en
Application granted granted Critical
Publication of GB2230013B publication Critical patent/GB2230013B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds

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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)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A moulding paste comprises a major proportion of a polyvinyl chloride (PVC) paste and a minor proportion of powdered slate. The paste is particularly suitable for the production of hollow articles with improved rigidity and insusceptibility to temperatures above normal room or shop temperatures.

Description

IMPROVEMENTS IN MOULDING PASTE This invention relates to moulding paste which may for example be used to produce articles of an ornamental nature.
A process known as rotational moulding, wherein a rotating member moves in all 'azimuths' within a heated chamber, is used to produce hollow articles.
A predetermined amount of moulding paste is injected into each individual mould and the movement of the rotating member causes the paste to flow in all directions within the mould. A skin of paste is produced on the inner surface of each mould and hence a hollow article is produced.
A known moulding paste is a polyvinyl chloride (PVC) paste, available in two grades of hardness.
However hollow mouldings produced with such paste do not tend to be sufficiently rigid and hence are unsuitable for ornamental use or the like. The mouldings also tend to soften when exposed to temperatures above the normal room or shop temperatures.
The object of this invention is to provide a moulding paste which overcomes the above disadvantages of PVC paste. This is achieved with a moulding paste in accordance with the invention which comprises a major proportion of a polyvinyl chloride (PVC) paste and a minor proportion of powdered slate. The powdered slate is finely ground, having particles of the order of 30-60 millimetres in size, preferably 50-55 millimetres.
This paste produces mouldings which are hard and, being hollow cast, enable large articles to be made which would otherwise be too heavy. The mouldings produced with the moulding paste according to the invention also exhibit improved temperature characteristics.
Also the addition of powdered slate to PVC paste eliminates the objectionable chemical odour usually associated with articles made purely from PVC paste.
In a moulding method according to the invention the powdered slate is added to the PVC paste and thoroughly mixed, prior to being injected into a mould, positioned within a heated chamber.
It has been found that the preferred ratio, by weight, of powdered slate to paste in 2.9%. This ratio produces mouldings which do not tend to crack and also results in adequate curing of the paste.
The temperature of the heated chamber should be sufficiently thoroughly to cure the paste.

Claims (6)

CLAIMS:
1. Moulding paste comprising a major proportion of a polyvinyl chloride (PVC) paste and a minor proportion of powdered slate.
2. Moulding paste as claimed in Claim 1 wherein the ratio, by weight, of powdered slate to PVC paste is 2.9%.
3. Moulding paste as claimed in claims 1 or 2 wherein the average size of the particles of powdered slate is between 30 and 60 mm.
4. Moulding paste as claimed in Claim 3 wherein the average size of the particles of powdered slate is between 50 to 55 mm.
5. A method for producing moulding paste wherein the powdered slate is added to the PVC paste and mixed thoroughly together and then the paste is injected into moulds which are positioned within a heated chamber.
6. Moulding paste substantially as described herein.
GB8907529A 1989-04-04 1989-04-04 Improvements in moulding paste Expired - Fee Related GB2230013B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8907529A GB2230013B (en) 1989-04-04 1989-04-04 Improvements in moulding paste

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8907529A GB2230013B (en) 1989-04-04 1989-04-04 Improvements in moulding paste

Publications (3)

Publication Number Publication Date
GB8907529D0 GB8907529D0 (en) 1989-05-17
GB2230013A true GB2230013A (en) 1990-10-10
GB2230013B GB2230013B (en) 1992-07-01

Family

ID=10654411

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8907529A Expired - Fee Related GB2230013B (en) 1989-04-04 1989-04-04 Improvements in moulding paste

Country Status (1)

Country Link
GB (1) GB2230013B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB784487A (en) * 1954-06-15 1957-10-09 Marley Floor Tile Company Ltd Improvements in or relating to compositions suitable as coverings for floors or walls
GB970596A (en) * 1962-01-11 1964-09-23 Monsanto Co Plasticized vinyl resin compositions
GB1004728A (en) * 1963-01-17 1965-09-15 Monsanto Co Plasticiser compositions and vinyl resin compositions containing the same
EP0026388A1 (en) * 1979-09-27 1981-04-08 BASF Lacke + Farben AG Use of coating compositions containing finely divided hollow particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB784487A (en) * 1954-06-15 1957-10-09 Marley Floor Tile Company Ltd Improvements in or relating to compositions suitable as coverings for floors or walls
GB970596A (en) * 1962-01-11 1964-09-23 Monsanto Co Plasticized vinyl resin compositions
GB1004728A (en) * 1963-01-17 1965-09-15 Monsanto Co Plasticiser compositions and vinyl resin compositions containing the same
EP0026388A1 (en) * 1979-09-27 1981-04-08 BASF Lacke + Farben AG Use of coating compositions containing finely divided hollow particles

Also Published As

Publication number Publication date
GB8907529D0 (en) 1989-05-17
GB2230013B (en) 1992-07-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950404