EP0273896A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Production of hollow articles
Assignee: Bayer Agriculture BVBA
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Filing: 1987-12-29
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Granted: —
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Expires: 2007-12-29
Abstract
Abstract Transparent hollow articles are blow-moulded from a composition comprising polyethylene terephthalate and styrene maleic anhydride copolymer (SMA), using a preform maintained at above the transition temperature of the SMA.
Inventors
- 👤 Daniel Louis Dufour
- 👤 Jean R. Pierre
- 👤 Peter Mayrhofer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0005; B29C2949/00; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29C2949/3048; B29C49/42; B29C49/64; B29C49/6604; B29C49/6605; B29K; B29K2067/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
A process for producing a blow-moulded hollow article from a polyester composition, in which a preform is made and thereafter expanded by means of differential fluid pressure into contact with a hollow mould of shape corresponding to that of the desired article, characterised in that (a) the polyester composition comprises polyethylene terephthalate (PET) and a styrene maleic anhydride copolymer (SMA) in a weight ratio of from 10 to 50 parts of SMA per hundred parts of (SMA + PET) and (b) the preform is maintained at a temperature above the transition temperature of SMA before it is expanded, whereby (c) the hollow article is substantially transparent.
Claim 2
Dependent Claim
106 words
A process for producing a blow-moulded hollow article from a polyester composition, in which a preform is made and thereafter expanded by means of differential fluid pressure into contact with a hollow mould of shape corresponding to that of the desired article, characterised in that (a) the polyester composition comprises polyethylene terephthalate (PET) and a styrene maleic anhydride copolymer (SMA) in a weight ratio of from 10 to 50 parts of SMA per hundred parts of (SMA + PET) and (b) the preform is maintained at a temperature above the transition temperature of SMA before it is expanded, whereby (c) the hollow article is substantially transparent.
Claim 3
Dependent Claim
15 words
A process of Claim 1 where the preform is a section of an extruded tube.
Claim 4
Dependent Claim
24 words
A process of Claim 1, wherein the preform is injection-moulded, the mould used in the injection-moulding step being maintained at between 20°C and 50°C.
Claim 5
Dependent Claim
29 words
A process of any of the preceding claims, wherein the composition contains form 15% to 30% by weight of SMA per hundred parts by weight of (SMA + PET).
Claim 6
Dependent Claim
21 words
A process of any of the preceding claims, wherein the SMA contains from 15 to 30% by weight of maleic anhydride.
Claim 7
Dependent Claim
45 words
A process of any of the preceding claims, wherein the SMA contains an additional comonomer in an amount so as to alter the refractive index of the SMA to approximate to that of the PET and thus further improve transparency of the resulting container walls.
Claim 8
Dependent Claim
52 words
A blow-moulded hollow article made from a polyester composition characterised in that (a) the composition comprises polyethylene terephthalate (PET) and a styrene maleic anhydride copolymer (SMA) in a weight ratio of from 10 to 50 parts of SMA per hundred parts of (SMA + PET) and (b) the article is substantially transparent.
Claim 9
Dependent Claim
52 words
A blow-moulded hollow article made from a polyester composition characterised in that (a) the composition comprises polyethylene terephthalate (PET) and a styrene maleic anhydride copolymer (SMA) in a weight ratio of from 10 to 50 parts of SMA per hundred parts of (SMA + PET) and (b) the article is substantially transparent.
Claim 10
Dependent Claim
22 words
An article of Claim 7, being a container that has been filled with a liquid at a temperature from 75 to 110°C.
Claim 11
Dependent Claim
22 words
An article according to Claim 7 or Claim 8, wherein the composition is as defined in any of Claims 4 to 6.
References Cited (Backward Citations)
No citation records indexed.
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