THERMALLY RESISTANT POLYAMIDE
Described herein are polyamides (PA) formed from a reaction mixture (RM) including a diamine component (DA) and a dicarboxylic acid component (DC). The diamine component (DA) includes at least 99 mol % of 1.3-bis (aminomethyl) cyclohexane (“1,3-BAC”) and the dicarboxyic acid component (DC) includes at least 90 mol % of terephthalic acid (“TA”). It was surprisingly found that the polyamides (PA) had and increased glass transition temperature (“Tg”), while maintaining high melting temperatures (“Tm”) and high crystallinity. More particularly, in some embodiments, the polyamides (PA) have a Tg of at least 165° C. a Tm of at least 280° C. and a heat of fusion (“ΔHf”) of at least 20 J/g. Due at least in part to the relative high Tg, Tm and crystallinity (measured by ΔHf), the polyamides (PA) can be advantageously used in high heat application settings, while maintaining desirable mechanical, electrical properties and chemical resistance
1 . A semi-crystalline polyamide (PA) comprising recurring units (R PA1 ) of formula:
the proportion of recurring units (R PA1 ) being between 90.0 mol % and 99.9 mol %, this proportion being relative to the total number of recurring units in the polyamide; and
exhibiting a melting temperature Tm of at least 280° C., as measured according to ASTM D3418.
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9 . A polyamide (PA) according to claim 1 , comprising the recurring units (R PA1 ) and either or both recurring units (R PA2 ) and (R PA3 ), represented by the following formulae, respectively:
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11 . The polyamide (PA) according to claim 1 , wherein the proportion of recurring units (R PA1 ) is between 90.0 mol % and 99.0 mol %.
12 . The polyamide (PA) according to a claim 9 and including either recurring units (R PA2 ) or recurring units (R PA3 ) as the only additional recurring units, wherein the proportion of the recurring units (R PA2 ) or (R PA3 ) is at least 1.0 mol %; and/or no more than 10.0 mol %
where (R PA2 ) and (R PA3 ) are respectively of formula:
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16 . The polyamide (PA) according to claim 2 and including both recurring units (R PA2 ) and recurring units (R PA3 ) as the only additional recurring units, wherein the proportion of each recurring unit (R PA2 ) and (R PA3 ) is between 1.0 mol % and 10.0 mol %;
where (R PA2 ) and (R PA3 ) are respectively of formula:
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18 . The polyamide (PA) according to claim 9 , wherein the recurring units of the polyamide consist essentially of recurring units (R PA1 ) and (R PA2 ); (R PA1 ) and (R PA3 ) or (R PA1 ), (R PA2 ) and (R PA3 ).
19 . The polyamide (PA) according to claim 9 , wherein the recurring units consist essentially of recurring units (R PA1 ) and (R PA2 );
(R PA1 ) and (R PA3 ) or (R PA1 ), (R PA2 ) and (R PA3 ),
wherein:
for the polyamide with recurring units (R PA1 ) and (R PA2 ) or with recurring units (R PA1 ) and (R PA3 ), the proportion of recurring units (R PA2 ) or (R PA3 ) (as the case may be) is between 1.0 mol % and 11.0 mol %;
for the polyamide with recurring units (R PA1 ), (R PA2 ) and (R PA3 ), the proportion of recurring units (R PA2 ) is between 1.0 mol % and 11.0 mol %; the proportion of recurring units (R PA3 ) is between 1.0 mol % and 11.0 mol %; and the total proportion of recurring units (R PA2 ) and (R PA3 ) is at most 11.0 mol %.
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21 . The polyamide (PA) of claim 1 , wherein the polyamide (PA) exhibits a glass transition temperature (“Tg”) of at least 165° C., and/or at most 220° C. as measured according to ASTM D3418.
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26 . The polyamide (PA) according to claim 1 , wherein the polyamide (PA) exhibits a melting temperature Tm of at most 340° C., as measured according to ASTM D3418.
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29 . The polyamide (PA) according to claim 1 , wherein the polyamide (PA) exhibits a heat of fusion (“AH?”) of at least 20.0 J/g, as measured according to ASTM D3418.
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31 . The polyamide (PA) according to claim 1 exhibiting the following thermal properties, as measured according to ASTM D3418:
a Tg between 195° C. and 210° C.; and
a Tm between 300° C. and 340° C.; and
a ΔH f of at least 30.0 J/g.
32 . The polyamide (PA) of claim 1 wherein the moieties derived from 1,3-BAC in the recurring units have a cis/trans ratio between 10/90 and 90/10.
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38 . A polymer composition (PC) comprising:
the polyamide (PA) of claim 1 and
a component selected from the group consisting of reinforcing agents, tougheners, plasticizers, colorants, pigments, antistatic agents, dyes, lubricants, thermal stabilizers, light stabilizers, flame retardants, nucleating agents, antioxidants and any combination of two or more thereof.
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42 . An article comprising the polyamide (PA) of claim 1 .
43 . The article of claim 4214 , wherein the article is selected from the group consisting of mobile electronics components, LED packaging, oil and gas components, food contact components, electrical and electronic device components, medical device components, construction components, industrial components, plumbing components, automotive parts, and aerospace parts.
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45 . An article comprising the polymer composition (PC) of claim 38 .