# US 2019/0375936 A1 · Low Viscosity Transparent Polyamide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0375936 A1 - Document ID: US20190375936A1 - Status: Published application - Kind: A1 - Application number: 16/550,628 - Filed: 2019-08-26 - Published: 2019-12-12 - Earliest claimed: 2015-07-09 - Assignees: Henkel IP & Holding GmbH - Applicants: Henkel IP & Holding GmbH - Inventors: Tina Nataniel; Dwight Heinrich - Web page: https://patentgrep.com/patent/US20190375936A1 ## CPC - C08L 77/10: Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids - C08G 69/265: {from at least two different diamines or at least two different dicarboxylic acids} - C08G 69/34: using polymerised unsaturated fatty acids - C08G 73/0627: {with only one nitrogen atom in the ring} - C08K 3/32: Phosphorus-containing compounds - C08L 77/08: from polyamines and polymerised unsaturated fatty acids - C08L 79/04: Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors - C08G 69/28: Preparatory processes - C08K 2003/329: {Phosphorus containing acids} - C08L 2201/10: Transparent films; Clear coatings; Transparent materials - C08L 2201/52: Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The transparent polyamide of claim 1 wherein the mixture comprises up to 20 wt. % of the second diamine different from the C4 to C8 alkylene diamine. ### Claim 3 (depends on 1) The transparent polyamide of claim 1 wherein the mixture comprises up to 20 wt. % of the second diamine which is selected from 3-(Aminomethyl)-3,5,5-trimethylcyclohexanamine (isophorone diamine); methylpentamethylenediamine; polyoxyalkylene diamine; poly(ethylene glycol) diamine; poly(propylene glycol) diamine; and mixtures thereof. ### Claim 4 (depends on 1) The transparent polyamide of claim 1 wherein the additives comprise phosphoric acid or polyphosphoric acid. ### Claim 5 (depends on 1) The transparent polyamide of claim 1 wherein the alkylene diamine comprises tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, 2-methyl-1,5-pentanediamine, and mixtures thereof. ### Claim 6 (depends on 1) The transparent polyamide of claim 1 wherein the alkylene diamine is hexamethylenediamine. ### Claim 7 (depends on 1) The transparent polyamide of claim 1 wherein the alkylene diamine is hexamethylenediamine and the dipiperidine comprises 4,4′(1,3 propanediyl) bis-(piperidine). ### Claim 8 (depends on 1) The transparent polyamide of claim 1 wherein the alkylene diamine is hexamethylenediamine, the dipiperidine is 4,4′(1,3 propanediyl) bis-(piperidine) and the second diamine is present in an amount up to 20 wt. % and is selected from 3-(Aminomethyl)-3,5,5-trimethylcyclohexanamine (isophorone diamine); methylpentamethylenediamine; polyoxyalkylene diamine; poly(ethylene glycol) diamine; poly(propylene glycol) diamine; and mixtures thereof. ### Claim 9 (depends on 1) The transparent polyamide of claim 1 wherein the polyamide has a viscosity at 210° C. of from 55 to 80 Poise. ### Claim 10 (depends on 1) The polyamide of claim 1 wherein the polyamide has a glass transition temperature of from −10 to +1° C. ### Claim 11 (depends on 1) The transparent polyamide of claim 1 wherein the polyamide has a mandrel bend of −15° C. to −30° C. ### Claim 12 (depends on 1) The transparent polyamide of claim 1 comprising up to 10 wt. % of the additives selected from antioxidant, light stabilizer, defoamer, phosphoric acid, polyphosphoric acid and mixtures thereof. ### Claim 13 (depends on 1) A composition comprising the transparent polyamide of claim 1 and up to 10 wt. % of the additives selected from antioxidant, light stabilizer, defoamer, phosphoric acid, polyphosphoric acid and mixtures thereof. ### Claim 14 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. ### Claim 15 (depends on 14) The method of claim 14 wherein the alkylene diamine comprises comprises tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, 2-methyl-1,5-pentanediamine, and mixtures thereof. ### Claim 16 (depends on 14) The method of claim 14 wherein the dipiperidine is 4,4′(1,3 propanediyl) bis-(piperidine). ### Claim 17 (depends on 14) The method of claim 14 wherein the additive comprises phosphoric acid or polyphosphoric acid. ### Claim 18 (depends on 14) The method of claim 14 wherein the additive is added to the reactant mixture or the reacted mixture.