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US 2019/0375936 A1Published application
Low Viscosity Transparent Polyamide
AssigneeHenkel IP & Holding GmbH
InventorsTina Nataniel, Dwight Heinrich
Life of this patent
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Abstract
A low viscosity and transparent polyamide and a method for making the same. The transparent polyamides comprise the reaction products of a fully hydrogenated dimer-acid; a second linear, saturated dicarboxylic acid; an alkylene diamine; a dipiperidine; optionally a second diamine different from the alkylene diamine; and optionally additives. The polyamides have low molten viscosity and high light transmittance.
Claims18
A transparent polyamide that is the reaction product of a mixture, comprising:
- 50 to 70 wt. % of a fully hydrogenated dimer acid;
- 5 to 12 wt. % of a linear, saturated C6 to C14 dicarboxylic acid;
- 10 to 18 wt. % of a C4 to C8 alkylene diamine;
- and
- 2 to 8 wt. % of a dipiperidine;
- 0 to 20 wt. % of a second diamine different from the alkylene diamine;
- and
- 0 to 10 wt. % of additive;
- wherein the weight percents are based on the total mixture weight and the polyamide has a minimum transmittance of 88% at 800 to 850 nm and a maximum Gardner color of 1.
6 more elements
A method of forming a polyamide comprising the steps of:
- forming a reaction mixture by combining 50 to 70 wt. % of a fully hydrogenated dimer acid;
- 5 to 12 wt. % of a linear, saturated C6 to C14 dicarboxylic acid;
- 10 to 18 wt. % of an alkylene diamine;
- 2 to 8 wt. % of a dipiperidine;
- 0 to 20 wt. % of a second diamine different from the alkylene diamine;
- and 0 to 10 wt. % of additives in a reaction vessel;
- heating the reaction mixture in the reaction vessel until reaction is substantially complete;
- removing volatile components from the reacted mixture;
- removing the vacuum and cooling the reaction products to room temperature;
- and
- recovering the formed polyamide;
- wherein the weight percents are based on the total mixture weight and the polyamide has a minimum transmittance of 88% at 800 to 850 nm and a maximum Gardner color of 1.
9 more elements
Dependencies are inferred from the claim text.