Foamed supramolecular polymers
View Patent ↗Process for the preparation of foamed supramolecular polymers characterized in that the foaming of the supramolecular polymer is carried out in the presence of blowing agents.
1. A process for the preparation of foamed supramolecular polymers characterized in that the foaming of the supramolecular polymer is carried out in the presence of a blowing agent, wherein the supramolecular polymer has the following general formula:
where
PU is a polymer chain comprising at least one polyurethane chain; and
n ranges from 0 to 8;
X, Y and Z, identical or different are H-bonding sites, wherein X and Y are obtained by the reaction of a terminal isocyanate group with a compound selected from the group consisting of 2-aminopyrimidine, isocytosine, 6-alkylisocytosine, 2-aminopyridine, 5-amino-uracil 6-tridecylisocytosine, 6-phenyl-isocytosine, 2-amino-6-(3-butenyl)-4-pyrimidone, p-di-(2-amino-6-ethyl-4-pyrimidone) benzene, 2-amino 4-pyridone, 4-pyrimidone 6-methyl-2-amino-4-pyrimidone, 6-ethyl-2-amino-4-pyrimidone, 6-phenyl-2-amino-4-pyrimidone, 6-(p-nitrophenyl)isocytosine, 6-(trifluoromethyl) isocytosine and their mixtures.
2. The process according to claim 1 wherein the blowing agent is selected from the group consisting of a thermally expandable microsphere, an endothermic blowing agent, an exothermic blowing agent, and mixtures thereof.
3. The process according to claim 2 wherein the endothermic blowing agent comprises bicarbonate or citrates.
4. The process according to claim 2 wherein the exothermic blowing agent comprises azodicarbonamide type compounds.
5. The process according claim 1 which is carried out by injection moulding.
6. The process according claim 2 which is carried out by injection moulding.
7. The process according to claim 2 wherein the amount of microspheres is between 0.5 and 4.0 parts by weight per 100 parts by weight of the supramolecular polymer.
8. The process according to claim 6 wherein the amount of microspheres is between 0.5 and 4.0 parts by weight per 100 parts by weight of the supramolecular polymer.
9. The process according to claim 1 , wherein X and Y are obtained by the reaction of a terminal isocyanate group with 2-aminopyrimidine or 6-alkylisocytosine.