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US 11,772,309 B2Granted
Flexible foaming process for producing thermally insulated articles
AssigneeBASF SE
InventorsHendrik Wagner, Marko Grever, Joachim Holle, Joerg Krogmann
Life of this patent
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Abstract
A flexible discontinuous process produces a series of at least two articles containing thermally insulating polyurethane foam from at least three streams (A), (B) and (C). The process involves mixing the at least three streams with different mixing ratios and injecting the mixture into cavities of the articles. A production unit can be used for performing this process.
Claims15
A discontinuous process for producing a series of at least two articles containing thermally insulating polyurethane foam from at least
- a stream (A) comprising at least one isocyanate reactive compound,
- a stream (B) comprising at least one organic polyisocyanate, and
- a stream (C) comprising either
- at least one compound selected from the group consisting of catalysts, blowing agents, chain extenders, stabilizers, crosslinkers, flame retardants, and additives, or
- at least one isocyanate reactive compound or at least one organic polyisocyanate, and optionally, at least one further compound selected from the group consisting of catalysts, blowing agents, chain extenders, stabilizers, crosslinkers, flame retardants, and additives;
- wherein stream (C) is different from both streams (A) and (B);
- wherein the process comprises:
- (a) producing at least one first article containing a first thermally insulating polyurethane foam by
- (a1) providing a first polyurethane reaction mixture in a mixing device (MD) by mixing at least two of streams (A), (B), and (C);
- (a2) injecting the first polyurethane reaction mixture provided in (a1) into a cavity of the at least one first article and forming the first thermally insulating polyurethane foam;
- and
- (b) producing at least one second article containing a second thermally insulating polyurethane foam by
- (b1) providing a second polyurethane reaction mixture in the mixing device (MD) by mixing at least two of streams (A), (B), and (C);
- (b2) injecting the second polyurethane reaction mixture provided in (b1) into a cavity of the at least one second article and forming the second thermally insulating polyurethane foam;
- wherein a mixing ratio of streams (A), (B), and (C) in (at) is different from a mixing ratio of streams (A), (B), and (C) in (b1),
- wherein an amount of stream (C) may be zero either in (a1) or in (b1), and
- wherein in case the amount of stream (C) is not zero in (a1) or (b1), an amount of stream (A) may be zero if stream (C) comprises at least one isocyanate reactive compound, and an amount of stream (B) may be zero if stream (C) comprises at least one organic polyisocyanate.
14 more elements
Dependencies are inferred from the claim text.