Patent ID: 9327430
Filing Date: 2016-05-03
CPC Classification: B29C,B29L,Y10T

Claim Text:
1. A method for preparing a rotomoulded article having asymmetrical layering that comprises the steps of: a) providing a mould for rotomoulding comprising 2 or more portions insulated from one another; b) thermally insulating one or more portions of the mould, and leaving remaining one or more portions of the mould not thermally insulated, wherein thermally insulating the one or more portions of the mould is achieved by lining the one or more portions of the mould with a thermally insulating sheet that separates the one or more portions of the mould that are thermally insulated from the one or more portions of the mould that are not thermally insulated; c) heating the one or more portions of the mould that are not thermally insulated; d) injecting a first polymeric material in the mould and submitting the mould to rotation about two perpendicular axes, said first polymeric material constituting an outer layer of a finished rotomoulded article for the one or more portions of the mould that are not thermally insulated, and wherein said first polymeric material is a first composition comprising: e) opening the mould and removing the thermally insulating sheet; f) injecting a second polymeric material in the mould and submitting the mould to rotation about two perpendicular axes, wherein the second polymeric material is different from the first polymeric material of step d), wherein said second polymeric material constitutes an outer layer of the finished rotomoulded article for the one or more portions of the mould that were thermally insulated during the injection of the first polymeric material and said second polymeric material is a second composition comprising: g) optionally repeating steps b) through f) or step f) alone; and h) retrieving the rotomoulded article having asymmetrical layering.