US 10,207,435 B2 · Pressure-dependent foam moulding of poly(meth)acrylimide particles in closed moulds for producing rigid foam cores

Abstract

The invention relates to a process for the production of mold-foamed poly(meth)acrylimide (P(M)I) cores, in particular of polymethacrylimide (PMI) cores, which can be used by way of example in automobile construction or aircraft construction. A feature of this process is that polymer granules or polymer powder preheated under pressure are moreover charged under pressure to a compression mold where they are foamed with depressurization. In particular, a feature of the process is that it optionally uses a preferably two-shell compression mold for the heating and also for the cooling of the granules and, respectively, the rigid foam core formed therefrom.

Claims16

Dependent claims

A process for the production of a rigid poly(meth)acrylimide foam core, the process comprising:

heating poly(meth)acrylimide particles to an atmospheric-pressure-foaming temperature T1 under a pressure p1 wherein a volume of the poly(meth)acrylimide particles increases by at most 10% by volume in 10 min,
charging the poly(meth)acrylimide particles to a mould and closing the mould, wherein the charging takes place at a pressure p2,
depressurizing a space within the mould to a pressure p3 at a temperature T2 and foaming the particles,
cooling the space within the mould to a temperature T3 thereby obtaining a rigid poly(meth)acrylimide foam core,
opening the mould and removing the rigid poly(meth)acrylimide foam core.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/321,845Filed 25 Jun 2015

Priority

DE 10 2014 009 33827 Jun 2014

Published

US 2017/0136665 A118 May 2017

Granted

19 Feb 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification25 codes

B29C 44/3415
Auxiliary operations: heating or cooling
B29C 44/143
The preformed part being a lining: means for positioning the lining in the mould
B29C 44/3461
Auxiliary operations: making or treating expandable particles
B29C 44/445
In solid form: in the form of expandable granules, particles or beads

Pressure-dependent foam moulding of poly(meth)acrylimide particles in closed moulds for producing rigid foam cores

Life of this patent

Pressure-dependent foam moulding of poly(meth)acrylimide particles in closed moulds for producing rigid foam cores

Life of this patent

Abstract

Claims16