Abstract:
The invention relates to a method for producing elastic foamed materials which are based on a melamine/formaldehyde condensation product. According to the inventive method, a pre-condensate, having a mol ratio of melamine to formaldehyde which is greater than 1: 2, is foamed. Practically no emission of formaldehyde emanates from the foamed materials. No signal or only a very low signal ranging from 65ppm to 85 ppm occurs in the NMR 13 C/MAS spectrum.
Abstract translation:本发明涉及一种方法,用于生产基于三聚氰胺/甲醛缩合产物的弹性泡沫体,其中,从大于1具有三聚氰胺到的甲醛的摩尔比预缩合:发泡2 该泡沫塑料显示出65〜85 ppm的,没有或仅有非常弱的信号的区域中无甲醛释放量实用C / MAS NMR谱中13发生。
Abstract:
The invention relates to expandable olefin bead polymers which comprise a blowing agent with a boiling point of from -5 to 150° C., selected from the group consisting of alkanes, alkanols, ketones, ethers and esters. The particles are unfoamed and have a bulk density above 500 g/l, and can be foamed to a bulk density below 200 g/l after storage for one hour at room temperature in free contact with the atmosphere. They are prepared by impregnating polyolefin pellets in suspension in a pressure vessel with the blowing agent, cooling the batch below 100° C., reducing the pressure and isolating the particles.
Abstract:
Expandovatelné kulicky z olefinových polymeru, obsahují nadouvadlo s teplotou varu od -5 do 150 .degree.C, vybrané ze skupiny skládající se z alkanu,alkanolu, ketonu, etheru a esteru, pricemz cástice jsou nenapenené a mají sypnou hmotnost vetsí nez400 g/l a mohou být napeneny na sypnou hmotnost mensí nez 200 g/l po skladování po dobu jedné hodiny pri teplote místnosti za volného kontaktu s atmosférou. Tyto kulicky se vyrábejí impregnací polyolefinových pelet nadouvadlem v suspenzi v tlakové nádobe, ochlazením sarze na teplotu nizsí nez 100 .degree.C, snízením tlaku a izolací cástic.
Abstract:
The invention relates to expandable polyolefin beads which comprise blowing agent and have been coated with from 0.01 to 3% by weight of a salt and/or ester of a long-chain fatty acid, preferably with calcium stearate, to prevent caking during foaming.
Abstract:
The invention relates to particle-shaped, expandable olefin polymers containing a foaming agent that has a boiling point between5 ~C and 150 ~C a nd is selected from an alkane, an alkanol, a ketone and an ether or an ester. T he particles are unfoamed and are provided with a bulk density of more than 500 g/l. After a storage time of one hour at room temperature and in a free atmosphere, the particles can be foamed in such a way that said particles ha ve a bulk density of less than 200 g/l. The particles are produced by impregnating polyolefin granules with the foaming agent in a suspension in a pressure container, by cooling the preparation to temperatures below 100 ~C and by expanding and separating the particles.
Abstract:
The invention relates to foam beads of propylene polymers which comprise more than 40% of open cells. They are produced by impregnating propylene polymer minigranules which comprise from 1 to 40% by weight of a cell opener with a volatile blowing agent in aqueous suspension and subsequently decompressing the mixture.
Abstract:
The invention relates to expandable olefin bead polymers which comprise a blowing agent with a boiling point of from -5 to 150° C., selected from the group consisting of alkanes, alkanols, ketones, ethers and esters. The particles are unfoamed and have a bulk density above 500 g/l, and can be foamed to a bulk density below 200 g/l after storage for one hour at room temperature in free contact with the atmosphere. They are prepared by impregnating polyolefin pellets in suspension in a pressure vessel with the blowing agent, cooling the batch below 100° C., reducing the pressure and isolating the particles.