ES2279791T3 - Composiciones de poliester de bajo contenido de aldehido residual. - Google Patents
Composiciones de poliester de bajo contenido de aldehido residual. Download PDFInfo
- Publication number
- ES2279791T3 ES2279791T3 ES01272651T ES01272651T ES2279791T3 ES 2279791 T3 ES2279791 T3 ES 2279791T3 ES 01272651 T ES01272651 T ES 01272651T ES 01272651 T ES01272651 T ES 01272651T ES 2279791 T3 ES2279791 T3 ES 2279791T3
- Authority
- ES
- Spain
- Prior art keywords
- tert
- butyl
- polyester
- bis
- additives
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- INNSFNJTGFCSRN-UHFFFAOYSA-N tridecyl 2-[(3,5-ditert-butyl-4-hydroxyphenyl)methylsulfanyl]acetate Chemical compound CCCCCCCCCCCCCOC(=O)CSCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 INNSFNJTGFCSRN-UHFFFAOYSA-N 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
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- QUEDXNHFTDJVIY-DQCZWYHMSA-N γ-tocopherol Chemical compound OC1=C(C)C(C)=C2O[C@@](CCC[C@H](C)CCC[C@H](C)CCCC(C)C)(C)CCC2=C1 QUEDXNHFTDJVIY-DQCZWYHMSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract
Una composición poliéster, estabilizada frente a la formación de contaminantes aldehídicos durante el proceso en fusión de dicha composición, que comprende (a) un poliéster, y (b) una cantidad estabilizante efectiva de una combinación de aditivos, en donde los aditivos se eligen entre dos grupos diferentes, en donde los grupos son (ii.) alcoholes polihídricos que se eligen del grupo constituido por almidón, celulosa, azúcar o alcohol de azúcar, trimetilol propano, trietilol propano, glicerol, sorbitol, pentaeritritol o dipentaeri- tritol, almidón degradado (dextrinas y ciclodex- trinas), maltosa y sus derivados, maltitol, hidra- to de maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de maltulosa, D, L-glucosa, dextrosa, sucrosa y D-mannitol, y (iii.) poliacrilamida, polimetacrilamida o un copolímero de acrilamida o metacrilamida con por lo menos un comonómero etilénicamente insustituido.
Description
Composiciones de poliéster de bajo contenido de
aldehído residual.
Una mezcla de un poliéster, tal como
poli(etilen tereftalato) PET, y una combinación aditiva,
cuando la extrusión compuesta exhibe un contenido de acetaldehido
residual inferior que el PET solo cuando se trata de modo similar.
La combinación de aditivo comprende compuestos elegidos de por lo
menos dos grupos en donde los grupos son (i).) copolímero de
poli(vinil alcohol) o etilen/vinil alcohol, (ii), alcoholes
polihídricos y (iii) poliacrilamida, polimetacrilamina o copolímero
de acrilamida o metacrilamida. El invento se refiere a cualquier
poliéster utilizado en la fabricación de botellas o contenedores
que a su vez se utilizan para almacenar materiales de consumo,
especialmente alimentos, bebidas y mas especialmente agua.
La U.S. 4.361.681 ilustra que el poliéster que
contiene agentes de bloqueo extremo de anhídrido tienen un ratio de
generación de acetaldehido reducido.
La U.S. 5.459.224 describe poliésteres que
tienen agentes de terminación extrema de
4-oxibencilideno para impartir mejorada
resistencia a las inclemencias atmosféricas y fotoestabilidad, pero
no se hace mención a la evolución de acetaldehido. Sin embargo, se
indica que estos poliésteres son apropiados para envasado de
alimentos y bebidas.
Los poliésteres pueden sintetizarse con una
serie de vías conocidas en el arte utilizando una variedad de
sistemas catalíticos. La
EP-A-0826713 ilustra que se producen
niveles inferiores de acetaldehido durante la copolimerización de
PET cuando está presente un fosfito tal como bis
(2,4-di-ter-butilfenil)pentaeritritol
fosfito durante la polimerización.
Las US. 4.837.115; U.S. 5.258.233; U.S.
5.266.413; U.S. 5.340.884; U.S. 5.648.032, U.S. 5.650.469;
WO-A-93/20147;
WO-A-93/23474;
WO-A-98/07786 y
WO-A-98/39388 ilustran que el uso de
poliamidas como un medio para reducir la concentración de
acetaldehido, presumiblemente vía una reacción de base Schiff con
el aldehido, que es reversible en presencia de agua.
La U.S. 5.856.385 ilustra el empleo de poliamida
o amida-cera para reducir el nivel de acetaldehido
que se produce cuando se calienta en poliolefinas agente de
clarificación a base de sorbitol.
La U.S. 5.011.890 describe la supresión de
formaldehido de acetaldehido cuando se utiliza poliacrilamida,
polimetacrilamida o acrilamida seleccionada o copolíemros de
metacrilamida en poliacetales. Una exigencia es que la
poliacrilamida o polimetacrilamida debe ser "no fundible" a la
temperatura de procesado del poliacetal. En esta patente no se
sugiere que utilizando poliacrilamida o polimetacrilamida en un
poliéster se reduzca la concentración de acetaldehido en una mezcla
combinada por fusión tal como vía extrusión.
La U.S. 4.394.470 describe una composición de
moldeo de polietilen tereftalato con un colorante caramelo. El
colorante caramelo puede haberse formado in situ a partir de
un mono- o disacárido.
La U.S. 5.681.879 describe una composición de
poliéster de retardo de llama que comprende una resina poliéster,
un alcohol polihídrico no inferior a 3 grupos hidroxilo, un
retardador de llama inorgánico y un retardador de llama a base de
halógeno.
La WO-A-00/66659
describe composiciones de moldeo que comprenden PET y aditivos de
alcohol polihídrico para la reducción de formación de
acetaldehido.
La WO-A-01/00724
describe el uso de polioles para reducir la formación de
acetaldehido en productos extruidos de PET.
El invento es útil para cualquier poliéster en
donde se forman o general compuestos aldehídicos, especialmente
acetaldehido durante el procesado térmico de dicho poliéster. El
procesado térmico de PET incluye la síntesis de PET, exposición
térmica durante la polimerización de estado sólido (SSP), cualquier
moldeo por inyección, moldeo de inyección-soplado o
moldeo de estirado-soplado utilizado en la
fabricación de preformas, parisones o botellas y contendores, o
extrusión de película, o durante cualquier procesado en fusión de
PET por encima de su temperatura de transición vítrea y por debajo
de su temperatura de descomposición.
El presente invento proporciona una cantidad
inferior de contaminantes (por ejemplo aldehidos) en botellas de
agua de PET proporcionando así sabor o aroma mejorados en agua
embotellada u otras bebidas embotelladas en dichos contenedores de
PET. La reducción en la cantidad de acetaldehido es altamente
beneficiosa a este respecto. El acetaldehido se conoce como un
producto de descomposición de poliésteres tal como PET. El
acetaldehido imparte un sabor o aroma indeseable a agua embotellada
almacenada en botellas de PET. Ha existido un prolongado objetivo
de búsqueda por parte de la industria para reducir el nivel de
acetaldehido que migra de las paredes de botellas de PET en el agua
u otra bebida almacenada. Se ha llevado a cabo una serie de cambios
de ingeniería o diseño en extrusoras, máquinas de moldeo por
inyección para preformas y maquinaría de fabricar botellas para
minimizar la formación de acetaldehido cuando se procesa
poli(etilen tereftalato) PET. Se ha llevado a cabo la
modificación de la propia composición de PET para reducir su punto
de fusión o su viscosidad en fusión con el fin de permitir menor
daño térmico o mecánico severo cuando se procesa PET para obtener
preformas o botellas.
La combinación de aditivo particular del
presente invento proporciona inesperados beneficios en las
composiciones de poliéster. Ciertas combinaciones de aditivo son
sinergísticas frente a la prevención de formación de aldehido
durante el proceso en fusión. Ciertas otras combinaciones de
aditivos proporcionan inesperadamente un equilibrio óptimo de bajo
color, baja turbidez y alta inhibición de aldehido. "Turbidez"
es un efecto de amarilleamiento perceptible indeseable.
El presente invento se refiere a una composición
poliéster, estabilizada frente a la formación de contaminantes
aldehídicos durante el proceso en fusión de dicha composición, que
comprende
- (a)
- un poliéster, y
- (b)
- una cantidad estabilizante efectiva de una combinación de aditivos, en donde los aditivos se eligen entre por lo menos dos grupos diferentes, en donde los grupos son
- (ii)
- alcoholes polihídricos que se eligen del grupo constituido por almidón, celulosa, azúcar o alcohol de azúcar, trimetilol propano, trietilol propano, glicerol, sorbitol, pentaeritritol o dipentaeritritol, almidón degradado (dextrinas y ciclodextrinas), maltosa y sus derivados, maltitol, hidrato de maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de maltulosa, D,L-glucosa, dextrosa, sucrosa y D-mannitol, y
- (iii)
- poliacrilamida, polimetacrilamida o un copolímero de acrilamida o metacrilamida con por lo menos un comonómero etilénicamente insustituido.
De preferencia el poliéster del componente (a)
es 95-99,9% en peso de la composición estabilizada;
y la combinación de aditivo del componente (b) es 5 a 0,1% en peso
de la composición estabilizada. Cada aditivo elegido de los grupos
(i.), (ii.) y (iii.) puede encontrarse de preferencia entre 1 y 99%
en peso de la combinación de aditivo total del componente (b).
El poliéster del componente (a) tiene unidades
repetitivas de ácido dicarboxílico elegidas del grupo constituido
por ácidos dicarboxílicos aromáticos que tienen de 8 a 14 átomos de
carbono, ácidos dicarboxílicos alifáticos con 4 a 12 átomos de
carbono, ácidos dicarboxílicos cicloalifáticos con 8 a 12 átomos de
carbono y sus mezclas.
De preferencia estos diácidos son ácido
tereftálico, ácido isoftálico, ácido o-ftálico,
ácido naftalen dicarboxílico, ácido ciclohexan dicarboxílico, ácido
ciclohexandiacético, ácido
difenil-4,4'-dicarboxílico, ácido
succínico, ácido maleico, ácido glutárico, ácido adípico, ácido
sebácico y sus mezclas.
Se prefiere especialmente ácido tereftálico,
ácido isoftálico y ácido 2,6-naftalen
dicarboxílico.
Preferentemente la porción diólica o glicólica
del poliéster del componente (a) se derivan de la fórmula genérica
HO-R-OH en donde R es una fracción
alifática, cicloalifática o aromática con 2 a 18 átomos de
carbono.
De preferencia estos dioles o glicoles son
etilenglicol, dietilenglicol, trietilenglicol,
propan-1,3-diol,
propan-1,2-diol,
butan-1,4-diol,
pentan-1,5-diol,
hexan-1,6-diol,
1,4-ciclohexandimetanol,
3-metilpentan-2,4-diol,
2-metilpentan-1,4-diol,
2,2-dietilpropan-1,3-diol,
1,4-di-(hidroxietoxi)benceno,
2,2-bis(4-hidroxiciclohexil)-propano,
2,4-dihidroxi-1,1,3,3-tetrametilciclobutano,
2,2-bis-(3-hidroxietoxifenil)propano,
2,2-bis-(4-hidroxipropoxi-fenil)etanol
y sus mezclas.
Mas preferentemente el diol es etilenglicol y
1,4-ciclohexandimetanol.
El poliéster del componente (a) es, de
preferencia, poli(etilen tereftalato) [PET] o
poli(etilen
2,6-naftalen-2,6-dicarboxilato);
mas preferentemente poli(etilen tereftalato).
Se contempla también que el poliéster del
componente (a) pueda ser también una mezcla de poliésteres o
copoliésteres incluyendo componentes citados antes.
Se contempla que el poliéster del componente (a)
pueda ser polímero virgen o alternativamente reciclado de polímero.
Adicionalmente es posible combinar de 80-99% en
peso de un poliéster con 20-1% en peso de un
concentrado en donde el concentrado comprende
10-90% en peso de una resina portadora de poliéster
y 90-10% en peso de la combinación aditiva descrita
para el componente (b).
Las nuevas composiciones proporcionadas por este
invento son útiles en la fabricación de contenedores o envases para
comestibles tal como bebidas y alimentos. Artículos moldeados de
estos poliésteres o poliamdias exhiben buena rigidez de pared
delgada, excelente claridad y buenas propiedades de barrera con
respecto a humedad y gases atmosféricos, particularmente dióxido de
carbono y oxígeno.
Los contendores plásticos y películas del
presente invento son construcciones mono- y/o
multi-capa rígidos o flexibles. Construcciones
multi-capa típicas tienen dos o mas laminados de
capa, fabricados mediante termoformado o extrusión de películas
flexibles multicapa, o extrusión de "preformas" o
"parisones" de botella seguido de moldeo por soplado
subsiguiente de las preformas en botellas. En un sistema multicapa,
pueden utilizarse capas de cualquier plástico apropiado.
Los contenedores y películas
multi-capa de este invento pueden formarse, por
ejemplo, a partir de capas de poliésteres, poliolefinas,
copolímeros poliolefínicos tal como acetato de
etilen-vinilo, poliestireno, poli(cloruro de
vinilo), poli(cloruro de vinilideno), poliamidas,
celulósicos, policarbonatos, alcohol
etilen-vinílico, poli(vinil alcohol),
estireno-acrilonitrilo e ionómeros, con la salvedad
de que por lo menos una capa comprende una composición poliéster o
poliamida del presente invento.
Para películas y envasado rígido (botellas),
típicamente la capa externa, y la capa mas interna en contacto con
el contenido, están compuestas, por ejemplo, por poliésteres tal
como PET o PEN [poli(etilen naftalato)], polipropileno, o
polietileno tal como HDPE. Las capas intermedias, con frecuencia
llamadas capas de "barrera" o "adhesivo" o "de
unión", están constituida por una o mas combinaciones de PET,
PEN, ionómero de polietileno carboxilato tal como Surlyn®,
homopolímeros o copolímeros de alcohol vinílico tal como
poli(vinil alcohol), poli(vinil acetato) parcialmente
hidrolizado,
poli(etilen-co-vinil alcohol
tal como EVOH o EVAL, nylons o poliamidas tal como Selar® (DuPont)
o poliamidas a base de metaxilendiamina (en ocasiones llamadas nylon
MXD-6), o cloruro de polivinilideno (PVDC), o
poliuretanos.
Así pues, el presente invento se refiere también
a un contenedor o película plástica mono- o
multi-capa, estabilizado frente la formación de
contaminantes aldehídicos durante el proceso de fusión de dicho
contenedor o película, que comprende por lo menos una capa que
comprende (a) un poliéster o poliamida, y (b) una cantidad
estabilizante efectiva de por lo menos una capa que comprende
- (a)
- un poliéster, y
- (b)
- una cantidad estabilizante efectiva de una combinación de aditivos, en donde los aditivos se eligen entre por lo menos dos grupos diferentes, en donde los grupos son
- (ii)
- alcoholes polihídricos que se eligen del grupo constituido por almidón, celulosa, azúcar o alcohol de azúcar, trimetilol propano, trietilol propano, glicerol, sorbitol, pentaeritritol o dipentaeritritol, almidón degradado (dextrinas y ciclodextrinas), maltosa y sus derivados, maltitol, hidrato de maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de maltulosa, D,L-glucosa, dextrosa, sucrosa y D-mannitol, y
- (iii)
- poliacrilamida, polimetacrilamida o un copolímero de acrilamida o metacrilamida con por lo menos un comonómero etilénicamente insustituido.
De preferencia el contenedor plástico es una
botella rígida.
Los contenedores rígidos pueden fabricarse con
procedimientos mecánicos conocidos:
a) Moldeo por soplado de una etapa tal como
llevado a cabo sobre máquinas Nissei, Aoki o Uniloy,
b) Moldeado por inyección en dos etapas de
pre-formas tal como sobre máquinas Netstal o Husky,
y pre-formas convertidas en botellas mediante
moldeo por soplado (por ejemplo sobre máquinas Sidel, Corpoplast y
Krones),
c) Moldeo por soplado integrado de
pre-formas a botellas, tal como procesos conducidos
sobre máquinas Sipa, Krupp Kautex, o Husky ISB, y
d) Moldeo por soplado de estirado (SBM) de
pre-formas a botellas.
Las pre-formas pueden ser de
construcción mono-capa o multi-capa.
Las botellas pueden post-tratarse opcionalmente
para alterar las propiedades de pared interna. Las botellas pueden
tratarse opcionalmente en la superficie sobre el exterior tal como
mediante aplicación de revestimientos superficiales. Absorbedores
UV y otros estabilizadores conocidos pueden estar presente en
estos revestimiento superficiales adicionados.
Con el empleo de técnicas de fraguado por calor
conocidas ciertos poliésteres son, en términos de color, I.V. y
distorsión térmica, estables a temperaturas de hasta alrededor de
100ºC. Estas características de estabilidad se refieren aquí como
estabilidad de "llenado en caliente". Los poliésteres lineales
mas preferidos utilizados en artículos que tienen estabilidad de
"llenado en caliente" comprenden poli(etilen
tereftlato), poli(etilen tereftalato) en donde hasta el 50
mol por ciento de los residuos de etilenglicol se han sustituido
con residuos derivados de 1,4-ciclohexandimetanol y
poli (etilen
2,6-naftalendi-carboxilato), en
donde los poliésteres han fraguado por calor suficientemente y
orientado por métodos bien conocidos en el arte para dar un grado
de cristalinidad deseado.
\newpage
Los compuestos del grupo (ii.) son alcoholes
polihídricos de la fórmula I
(I)-E-(OH)_{n}
en
donde
n es 2 a 4000, y
E es una fracción de hidrocarbilo.
Una fracción hidrocarbílica de conformidad con
este invento es, por ejemplo, una fracción alifática,
cicloalifática, aromática o una fracción mono-, di- o
poli-sacárida.
Las fracciones hidrocarbílicas para la
definición de G pueden estar interrumpidas por heteroátomos, por
ejemplo por -O-.
Alcoholes polihídricos del componente (d) pueden
ser, por ejemplo glicerina, 1,2,3-butantriol,
1,2,4-butantriol, eritritol, ribitol, xilitol,
dulcitol, sorbitol, 1,2,3-ciclolhexatriol, inositol,
glucosa, galactosa, manosa, ácido galacturónico, xilosa,
glucosamina, galactosamina,
1,1,2,2-tetrametilolciclohexano,
1,1,1-trimetilolpropano,
1,1,2-trimetilolpropano,
1,1,1-trimetilolbutano,
1,1,2-trimetilolbutano,
1,1,1-trimetilolpentano,
1,1,2-trimetilolpentano,
1,2,2-trimetilolpentano, trimetilolpentano,
penta-eritritol, dipenteritritol,
1,1,3,3-tetrahidroxipropano,
1,1,5,5-tetrahidroxipentano,
2,2,6,6-tetrakis(hidroximetil)-ciclohexano
y
2,2,6,6-tetrakis(hidroximetil)ciclohexanol.
El alcohol polihídrico es, por ejemplo, almidón,
celulosa o un azúcar o un alcohol de azúcar.
Los alcoholes polihídricos incluyen almidón
degradado (dextrinas y ciclodextrinas), maltosa y sus derivados,
maltitol, hidrato de maltopentaosa, maltotetraosa, monohidrato de
maltulosa, D,L-glucosa, dextrosa, sucrosa y
D-manitol.
Alcoholes polihídricos comerciales incluyen
trimetilol propano, trietilol propano, glicerol, sorbitol y
dipentaeritritol.
El polímero del grupo (iii.) es cualquier
polímero que contenga una unidad repetitiva de acrilamida o
metacrilamida polimerizada. La preparación de polímeros de
acrilamida o metacrilamida es generalmente conocida.
De preferencia el polímero del grupo (iiia) es
poliacrilamida, polimetacrilamida o un copolímero de acrilamida o
metacrilamida con otro monómero etilénicamente insaturado que es
acrilamida, metacrilamida, estireno, etileno, un alquil acrilato,
un alquil metacrilato,
N-vinil-2-pirrolidinona
o acrilonitrilo.
Otros comonómeros preferidos para el grupo (iii)
son los hidroxialquil metacrilatos, los hidroxialquil acrilatos o
dimetilaminoetil metacrilato. En estos casos los copolímeros
resultantes contienen grupos de amina reactivos aldehídicos como
fracciones de hidroxilo reactivos aldehídicos.
Es de especial interés como polímero del grupo
(iii.) un copolímero de acrilamida o metacrilamida con otros
monómero etilénicamente insaturado que es un hidroxialquil
metacrilato, un hidroxialquil acrilato o dimetilaminetil
metacrilato.
Más preferentemente el polímero del grupo (iiia)
es poliacrilamida (PERCOL® 333, Ciba SC) o poliacrilamida (PERCOL®
351, Ciba SC).
Los copolímeros del grupo (iii.) pueden ser
copolímeros aleatorios o de bloque.
Se contempla que las composiciones puedan
contener otros componentes o modificadores tal como estabilizadores,
dispersantes, pigmentos, colorantes, absorbedores UV,
antioxidantes, agentes endurecedores, agentes nucleantes y rellenos
como se describe en U.S. 5.011.890, cuyas partes pertinentes se
incorporan aquí como referencia.
El presente invento se refiere también a un
procedimiento para prevenir la formación de contaminantes
aldehídicos durante el proceso en fusión de un poliéster que
comprende incorporar en dicho poliéster una cantidad estabilizante
efectiva de una combinación de aditivos, en donde los aditivos se
eligen entre dos grupos diferentes, en donde los grupos son (ii.)
alcoholes polihídricos que se eligen del grupo constituido por
almidón, celulosa, un azúcar o alcohol de azúcar, trimetilol
propano, trietilol propano, glicerol, sorbitol, pentaeritritol o
dipentaeritritol, almidón degradado (dextrinas y ciclodextrinas),
maltosa y sus derivados, maltitol, hidrato de maltopentaosa,
maltoheptaosa, maltotetraosa, monohidrato de maltulosa,
D,L-glucosa, dextrosa, sucrosa y
D-mannitol, y (iii.) poliacrilamida,
polimetacrilamida o un copolímero de acrilamida o metacrilamida con
por lo menos un comonómero etilénicamente no sustituido.
Una modalidad preferida del presente invento es
por consiguiente el empleo del componente (b) para prevenir la
formación de contaminantes aldehídicos durante el proceso de fusión
de un poliéster.
El presente invento se refiere también a un
procedimiento para formar una preforma de botella o una botella o
contenedor de PET apropiado para guardar agua (mineral, natural,
ozonada) u otros alimentos, que permite que el sabor deseable del
agua o alimento después de envasado quede inalterado después de
disponerse en dicha botella o contenedor preparado a partir de la
composición poliéster o poliamida del presente invento.
El contenedor plástico que nos ocupa o película
estabilizado con un compuesto o compuestos del componente (b) puede
también incorporarse opcionalmente o aplicarse de 0,01 a 10% en peso
y mas preferentemente en una cantidad de 0,1 a 3% basado en el peso
total de la composición, de coaditivos adicionales tal como
antioxidantes, otros absorbedores UV, amidas impedidas, fosfitos o
fosfonitos, benzofuran-2-onas,
tiosinergistas, estabilizadores de poliamida, estearatos de metal,
agentes nucleantes, rellenos, agentes de refuerzo, lubricantes,
emulgentes, colorantes, pigmentos, abrillantadores ópticos,
retardadores de llama, agentes antiestáticos, agentes de soplado y
similares, tal como los materiales expuestos a continuación o sus
mezclas.
1.1. Monofenoles alquilados, por ejemplo
2,6-di-ter-butil-4-metilfenol,
2-ter-butil-4,6-dimetilfenol,
2,6-di-ter-butil-4-etilfenol,
2,6-di-ter-butil-4-n-butilfenol,
2,6-di-ter-butil-4-isobutilfenol,
2,6-diciclopentil-4-metilfenol,
2-(alfa-metil-ciclohexil)-4,6-dimetilfenol,
2,6-dioctadecil-4-metilfenol,
2,4,6-triciclohexilfenol,
2,6-di-ter-butil-4-metoximetilfenol,
nonilfenoles que son lineales o ramificados en las cadenas
laterales, por ejemplo
2,6-di-nonil-4-metilfenol,
2,4-dimetil-6-(1'-metilundec-1'-il)-fenol,
2,4-di-metil-6-(1'-metilheptadec-1'-il)fenol,
2,4-dimetil-6-(1'-metiltridec-1'-il)fenol
y sus mezclas.
1.2. Alquiltiometilfenoles, por ejemplo
2,4-dioctiltiometil-6-ter-butilfenol,
2,4-dioctiltiometil-6-metilfenol,
2,4-dioctiltiometil-6-etilfenol,
2,6-di-dode-ciltio-metil-4-nonilfenol.
1.3. Hidroquinonas e hidroquinonas
alquiladas, por ejemplo
2,6-di-ter-butil-4-metoxifenol,
2,5-di-ter-butilhidroquinona,
2,5-di-ter-amilhidroquinona,
2,6-difenil-4-octadecicloxifenol,
2,6-di-ter-butilhidroquinona,
2,5-di-ter-butil-4-hidroxianisol,
3,5-di-terbutil-4-hidroxianisol,
3,5-di-ter-butil-4-hidroxifenil
estearato,
bis-(3,5-di-ter-butil-4-hidroxifenil)adipato.
1.4. Tocoferoles, por ejemplo
alfa-tocoferol, beta-tocoferol,
gamma-tocoferol, delta-tocoferol y
sus mezclas (Vitamina E).
1.5. Tiodifenil éteres hidroxilados, por
ejemplo 2,2'-tiobis
(6-ter-butil-4-metilfenol),
2,2'-tiobis(4-octilfenol),
4,4'-tiobis-(6-ter-butil-3-metilfenol),
4,4'-tiobis-(6-ter-butil-2-metilfenol),
4,4'-tiobis-(3,6-di-sec-amilfenol),
4,4'-bis(2,6-dimetil-4-hidroxifenil)disulfuro.
1.6. Alquilidenbisfenoles, por ejemplo
2,2'-metilenbis(6-ter-butil-4-metilfenol),
2,2'-metilenbis(6-ter-butil-4-etilfenol),
2,2'-metilenbis[4-metil-6-(alfa-metilciclohexil)fenol],
2,2'-metilenbis
(4-metil-6-ciclohexilfenol),
2,2'-metilenbis(6-nonil-4-metilfenol),
2,2'-metilenbis(4,6-di-ter-butilfenol),
2,2'-etilidenbis(4,6-di-ter-butilfenol),
2,2'-etili-
denbis(6-ter-butil-4-isobutilfenol), 2,2'-metilenbis[6-(alfa-metilbencil)-4-nonilfenol], 2,2'-metilenbis [6-(alfa,alfa-dimetilbencil)-4-nonil-fenol], 4,4'-metilenbis(2,6-di-ter-butilfenol), 4,4'-metilen-bis(6-ter-butil-2-metilfenol), 1,1-bis(5-ter-butil-4-hidroxi-2-metilfenil))butano, 2,6-bis(3-ter-butil-5-metil-2-hidroxibencil)-4-metilfenol, 1,1,3-tris (5-ter-butilo-4-hidroxi-2-metilfenil)butano, 1,1-bis(5-ter-butil-4-hidroxi-2-metilfenil)-3-n-dodecilmercaptobutano, bis[3,3-bis(3'-terbutil-4'-hidroxifenil)-butirato] de etilenglicol, bis(3-ter-butil-4-hidroxi-5-metilfenil)diciclopentadieno, bis[2-(3'-tri-butil-2'-hidroxi-5'-metilbencil)-6-ter-butil-4-metilfenil]tereftalato, 1,1-bis-(3,5-dimetil-2-hidroxifenil)butano, 2,2-bis-(3,5-di-ter-butil-4-hidroxifenil)propano, 2,2-bis(5-ter-butil-4-hidroxi-2-metilfenil)-4-n-dodecilmercaptobutano, 1,1,5,5-tetra-(5-ter-butil-4-hidroxi-2-metilfenil)pentano.
denbis(6-ter-butil-4-isobutilfenol), 2,2'-metilenbis[6-(alfa-metilbencil)-4-nonilfenol], 2,2'-metilenbis [6-(alfa,alfa-dimetilbencil)-4-nonil-fenol], 4,4'-metilenbis(2,6-di-ter-butilfenol), 4,4'-metilen-bis(6-ter-butil-2-metilfenol), 1,1-bis(5-ter-butil-4-hidroxi-2-metilfenil))butano, 2,6-bis(3-ter-butil-5-metil-2-hidroxibencil)-4-metilfenol, 1,1,3-tris (5-ter-butilo-4-hidroxi-2-metilfenil)butano, 1,1-bis(5-ter-butil-4-hidroxi-2-metilfenil)-3-n-dodecilmercaptobutano, bis[3,3-bis(3'-terbutil-4'-hidroxifenil)-butirato] de etilenglicol, bis(3-ter-butil-4-hidroxi-5-metilfenil)diciclopentadieno, bis[2-(3'-tri-butil-2'-hidroxi-5'-metilbencil)-6-ter-butil-4-metilfenil]tereftalato, 1,1-bis-(3,5-dimetil-2-hidroxifenil)butano, 2,2-bis-(3,5-di-ter-butil-4-hidroxifenil)propano, 2,2-bis(5-ter-butil-4-hidroxi-2-metilfenil)-4-n-dodecilmercaptobutano, 1,1,5,5-tetra-(5-ter-butil-4-hidroxi-2-metilfenil)pentano.
1.7. Compuestos O-, N- y
S-bencilo, por ejemplo
3,5,3',5'-tetra-ter-butil-4,4'-dihidroxidibencil
éter,
octadecil-4-hidroxi-3,5-dimetilbencilmercaptoacetato,
tridecil-4-hidroxi-3,5-di-ter-butilbencilmercaptoacetato,
tris
(3,5-di-ter-butil-4-hidroxibencil)amina,
bis(4-ter-butil-3-hidroxi-2,6-dimetilbencil)ditiotereftalato,
bis(3,5-di-ter-butil-4-hidroxibencil)sulfuro,
iso-octil-3,5-di-ter-butil-4-hidroxibencilmercaptoacetato.
1.8. Malonatos hidroxibencilados, por
ejemplo
dioctadecil-2,2-bis-(3,5-di-ter-butil-2-hidroxibencil)-malonato,
di-octadecil-2-(3-ter-butil-4-hidroxi-5-metilbencil)-malonato,
di-dodecilmercaptoetil-2,2-bis-(3,5-di-ter-butil-4-hidroxibencil)malonato,
di[4-(1,1,3,3-tetrametilbutil)fenil]-2,2-bis(3,5-di-ter-butil-4-hidroxibencil)malonato.
1.9. Compuestos hidroxibencílicos
aromáticos, por ejemplo
2,3,5-tris-(3,5-di-ter-butil-4-hidroxibencil)-2,4,6-trimetilbenceno,
1,4-bis(3,5-di-ter-butil-4-hidroxibencil)-2,3,5,6-tetrametilbenceno,
2,4,6-tris
(3,5-di-ter-butil-4-hidroxibencil)-fenol.
1.10. Compuestos triazínicos, por ejemplo
2,4-bis(octilmercapto)-6-(3,5-di-ter-butil-4-hidroxianilino)-1,3,5-triazina,
2-octilmercapto-4,6-bis(3,5-di-ter-butil-4-hidroxianilino)-1,3,5-triazina,
2-octilmercapto-4,6-bis(3,5-di-ter-butil-4-hidroxifenoxi)-1,3,5-triazina,
2,4,6-tris(3,5-di-ter-butil-4-hidroxifenoxi)-1,2,3-triazina,
1,3,5-tris
(3,5-di-ter-butil-4-hidroxibencil)-isocianurato,
1,3,5-tris(4-ter-butil-3-hidroxi-2,6-dimetil-bencil)isocianurato,
2,4,-6-tris
(3,5-di-ter-butil-4-hidroxifeniletil)-1,3,5-triazina,
1,3,5-tris(3,5-di-ter-butil-4-hidroxifenilpropionil)-hexahidro-1,3,5-triazina,
1,3,5-tris-(3,5-di-ciclohexil-4-hidroxibencil)isocianuarato.
1.11. Bencilfosfonatos, por ejemplo
dimetil-2,5-di-ter-butil-4-hidroxibencilfosfonato,
dietil-3,5-di-ter-butil-4-hidroxibencilfosfonato,
dioctadecil-3,5-di-ter-butil-4-hidroxibencilfosfonato,
dioctadecil
5-ter-butil-4-hidroxi-3-metilbencilfosfonato,
la sal cálcica del éster mono-etílico de ácido
3,5-di-ter-butil-4-hidroxibencilfosfónico.
1.12. Acilaminofenoles, por ejemplo
4-hidroxilauranilida,
4-hidroxiestearanilida, octil
N-(3,5-di-ter-butil-4-hidroxifenil)carbamato.
1.13. Esteres de ácido
beta-(3,5-di-ter-butil-4-hidroxifenil)propiónico
con alcoholes mono- o polihídricos, por ejemplo con metanol,
etanol, n-octanol, i-octanol,
octadecanol, 1,6-hexandiol,
1,9-nonandiol, etilenglicol,
1,2-propandiol, neopentilglicol, tiodietilenglicol,
dietilenglicol, trietilenglicol, pentaeritritol,
tris(hidroxietil)isocianuarato,
N,N'-bis(hidroxietil)oxamida,
3-tiaundecanol, 3-tiapentadecanol,
trimetilhexandiol, trimetilolpropano,
4-hidroximetil-1-fosfa-2,6,7-trioxabiciclo-[2.2.2]octano.
1.14. Esteres de ácido
beta-(5-ter-butil-4-hidroxi-3-metilfenil)propiónico
con alcoholes mono- o poli-hídricos, por ejemplo
con metanol, etanol, n-octanol,
i-octanol, octadecanol,
1,6-hexandiol, 1,9-nonandiol,
etilenglicol, 1,2-propandiol,
neo-pentil glicol, tiodietilenglicol,
dietilenglicol, trietilenglicol, pentaeritritol,
tris(hidroxietil)-isocianuarato, diamida de
ácido N,N'-bis(hidroxietil)oxálico,
3-tiaundecanol,
3-tia-pentadecanol,
trimetilhexandiol, trimetilolpropano,
4-hidroximetil-1-fosfa-2,6,7-trioxabiciclo[2.2.2]octano;
3,9-bis[2-{3-(3-terbutil-4-hidroxi-5-metilfenil)propioniloxi}-1,1-dimetil-etil]-2,4,8-tetraoxaspiro[5.5]-undecano.
1.15. Esteres de ácido
\beta-(3,5-diciclohexil-4-hidroxi-fenilpropiónico
con alcoholes mono- o polihídricos, por ejemplo con metanol,
etanol, octanol, octadecanol, 1,6-hexandiol,
1,9-nonandiol, etilenglicol,
1,2-propandiol, neopentilglicol, tiodietilenglicol,
dietilenglicol, trietilenglicol, pentaeritritol,
tris(hidroxietil)iso-cianurato,
N,N'-bis(hidroxietil)-oxamida,
3-tiaundecanol, 3-tiapentadecanol,
trimetilhexandiol, trimetilolpropano,
4-hidroximetil-1-fosfa-2,6,7-trioxabiciclo-[2.2.2]-octano.
1.16. Esteres de ácido
3,5-di-ter-butil-4-hidroxifenil
acético con alcoholes mono- o polihídricos, por ejemplo con
metanol, etanol, octanol, octadecanol,
1,6-hexandiol, 1,9-nonandiol,
etilenglicol, 1,2-propandiol, neopentil glicol,
tiodietilenglicol, dietilenglicol, trietilenglicol, pentaeritritol,
tris(hidroxietil)isocianurato,
N,N'-bis(hidroxietil)oxamida,
3-tiaundecanol, 3-tiapentadecanol,
trimetilhexandiol, trimetilolpropano,
4-hidroximetil-1-fosfa-2,6,7-trioxabiciclo-
[2,2,2]-octano.
[2,2,2]-octano.
1.17. Amidas de ácido
beta-(3,5-di-ter-butil-4-hidroxi-fenil)propiónico
por ejemplo
N,N'-bis(3,5-di-ter-butil-4-hidroxifenilpropionil)hexametilendiamida,
N,N'-bis(3,5-di-ter-butil-4-hidroxifenilpropionil)trimetilendiamida,
N,N'-bis-(3,5-di-ter-butil-4-hidroxifenilpropionil)hidrazina,
N,N'-bis[2-(3-[3,5-di-ter-butil-4-hidroxifenil]propioniloxi)-
etil]oxamida (Naurgard^{R}XL-1 suministrado por Uniroyal).
etil]oxamida (Naurgard^{R}XL-1 suministrado por Uniroyal).
1.18. Ácido ascórbico (vitamina C)
1.19. Antioxidantes amínicos, por ejemplo
N,N'-di-isopropil-p-enilendiamina,
N,N'-di-sec-butil-p-fenilendiamina,
N,N'-bis-(1,4-dimetilpentil)-p-fenilendiamina,
N,N'-bis(1-etil-3-metilpentil)-p-fenilendiamina,
N,N'-bis(1-metilheptil)-p-fenilendiamina,
N,N'-diciclohexil-p-fenilendiamina,
N,N'-difenil-p-fenilendiamina,
N,N'-bis(2-naftil)-p-fenilendiamina,
N-iso-propil-N'-fenil-p-fenilendiamina,
N-(1,3-dimetilbutil)-N'-fenil-p-fenilendiamina,
N-(1-metilheptil)-N'-fenil-p-fenilendiamina,
N-ciclohexil-N'-fenil-p-fenilendiamina,
4-(p-toluensulfamoil)-difenilamina,
N,N'-dimetil-N,N'-di-sec-butil-p-fenilendiamina,
difenilamina, N-alildifenilamina,
4-isopropoxi-difenilamina,
N-fenil-1-naftilamina,
N-(4-ter-octilfenil)-1-naftilamina,
N-fenil-2-naftilamina,
difenilamina octilada, por ejemplo
p,p'-di-ter-octildifenilamina,
4-n-butilaminofenol,
4-butirilaminofenol,
4-nonanoilaminofenol,
4-dodecanoilaminofenol,
4-octadecanoilaminofenol,
bis(4-metoxifenil)amina,
2,6-di-ter-butil-4-dimetil-aminometilfenol,
2,4'-diaminodifenil-metanol,
4,4'-diaminodifenilmetano,
N,N,N',N'-tetrametil-4,4'-diaminodifenilmetano,
1,2-bis[(2-metilfenil)-amino]etano,
1,2-bis(fenilamino)propano,
(o-tolil)biguanida,
bis[4-(1',3'-dimetilbutil)fenil]amina,
N-fenil-1-naftilamina
ter-octilada, una mezcla de
ter-butil/teroctildifenilaminas mono- y
dialquiladas, una mezcla de nonildifenilaminas mono- y
dialquiladas, una mezcla de dodecildifenilaminas mono- y
dialquiladas, una mezcla de isopropill/isohexildifenilaminas mono-
y dialquiladas, una mezcla de ter-butildifenilaminas
mono- y dialquiladas,
2,3-dihidro-3,3-dimetil-4H-1,4-benzotiacina,
fenotiazina, una mezcla de
ter-butil/ter-octilfenotiazinas
mono- y dialquiladas, una mezcla de
ter-octil-fenotiazinas mono- y
dialquiladas, N-alilfenotiazina,
N,N,N',N'-tetrafenil-1,4-diaminobut-2-eno.
2.1.
2-(2'-hidroxifenil)benzotriazoles, por
ejemplo
2-(2'-hidroxi-5'metilfenil)-benzotriazol,
2-(3',5'-di-ter-butil-2'-hidroxifenil)benzotriazol,
2-(5'-ter-butil-2'-hidroxifenil)benzotriazol,
2-(2'-hidroxi-5'-(1,1,3,3-tetrametil-butil)fenil)-benzotriazol,
2-(3',5'-di-ter-butil-2'-hidroxifenil)-5-cloro-benzotriazol,
2-(3'-ter-butil-2'-hidroxi-5'-metilfenil)-5-cloro-benzotriazol,
2-(3'-sec-butil-5'-ter-butil-2'-hidroxifenil)benzotriazol,
2-(2'-hidroxi-4'-octiloxifenil)benzotriazol,
2-(3',5'-di-ter-amil-2'-hidroxifenil)benzotriazol,
2-(3',5'-bis-(alfa,alfa-dimetil-bencil)-2'-hidroxifenil)benzotriazol,
2-(3'-ter-butil-2'-hidroxi-5'-(2-octiloxicarbonil-etil)fenil)-5-cloro-benzotriazol,
2-(3'-ter-butil-2'-hidroxi-5'-(2-metoxicarboniletil)fenil)-5-cloro-benzotriazol,
2-(3'-ter-butil-2'-hidroxi-5'-(2-metoxicarboniletil)fenilbenzotriazol,
2-(3'-ter-butil-2'-hidroxi-5'-(2-octiloxicarboniletil)fenil)-benzotriazol, 2-(3'-dodecil-2'-hidroxi-5'-metilfenil)benzotriazol, 2-(3'-ter-butil-2'-hidroxi-5'-(2-isooctiloxicarboniletil)fenil-benzotriazol, 2,2'-metilen-bis[4-(1,1,3,3-tetrametilbutil)-6-benzotriazol-2-ilfenol]; el producto de trans-esterificación de 2-[3'-ter-butil-5'-(2-metoxicarboniletil)-2'-hidroxifenil]-2H-benzotriazol con polietilenglicol 300; [R-CH_{2}CH_{2}-COO-CH_{2}CH_{2}]_{2}- en donde R = 3'-ter-butil-4'-hidroxi-5'-2H-benzotriazol-2-ilfenilo, 2-[2'-hidroxi-3'-(alfa,alfa-dimetil-bencil)-5'-(1,1,2,2-tetra-metilbutil)-fenil]-benzotriazol; 2-[2'-hidroxi-3'-(1,1,3,3-tetrametilbutil)-5'-(alfa,alfa-dimetilbencil)-fenil]benzotriazol.
2-(3'-ter-butil-2'-hidroxi-5'-(2-octiloxicarboniletil)fenil)-benzotriazol, 2-(3'-dodecil-2'-hidroxi-5'-metilfenil)benzotriazol, 2-(3'-ter-butil-2'-hidroxi-5'-(2-isooctiloxicarboniletil)fenil-benzotriazol, 2,2'-metilen-bis[4-(1,1,3,3-tetrametilbutil)-6-benzotriazol-2-ilfenol]; el producto de trans-esterificación de 2-[3'-ter-butil-5'-(2-metoxicarboniletil)-2'-hidroxifenil]-2H-benzotriazol con polietilenglicol 300; [R-CH_{2}CH_{2}-COO-CH_{2}CH_{2}]_{2}- en donde R = 3'-ter-butil-4'-hidroxi-5'-2H-benzotriazol-2-ilfenilo, 2-[2'-hidroxi-3'-(alfa,alfa-dimetil-bencil)-5'-(1,1,2,2-tetra-metilbutil)-fenil]-benzotriazol; 2-[2'-hidroxi-3'-(1,1,3,3-tetrametilbutil)-5'-(alfa,alfa-dimetilbencil)-fenil]benzotriazol.
2.2.
2-hidroxibenzofenonas, por ejemplo los
derivados 4-hidroxi, 4-metoxi,
4-octiloxi, 4-deciloxi,
4-dodeciloxi, 4-benciloxi,
4,2',4'-trihidroxi y
2'-hidroxi-4,4'-dimetoxi.
2,3. Esteres de ácidos benzoicos sustituidos
e insustituidos, como, por ejemplo,
4-terbutilfenil salicilato, fenil salicilato,
octilfenil salicilato, dibenzoilresorcinol,
bis(4-ter-butilbenzoil)-resorcinol,
benzoilresorcinol,
2,4-di-ter-butilfenil
3,5-di-ter-butil-4-hidroxibenzoato,
hexadecil
3,5-di-ter-butil-4-hidroxibenzoato,
octadecil
3,5-di-ter-butil-4-hidroxibenzoato,
2-metil-4,6-di-ter-butilfenil
3,5-di-ter-butil-4-hidroxibenzoato.
2.4. Acrilatos, por ejemplo
alfa-ciano-beta,beta-difenil-acrilato
de etilo,
alfa-ciano-beta,beta-difenilacrilato
de isooctilo, alfa-carbometoxicianamato de metilo,
alfa-ciano-beta-metil-p-metoxicinamato
de metilo,
alfa-ciano-beta-metil-p-metoxicinamato
de butilo,
alfa-carbometoxi-p-metoxicinamato
de metilo y
N-(beta-carbometoxi-beta-cianovinil)-2-metilindolina.
2.5. Compuestos de níquel, por ejemplo
complejos de níquel de
2,2'-tio-bis-[4-(1,1,3,3-tetrametilbutil)fenol],
tal como el complejo 1:1 o 1:2, con o sin ligandos adicionales tal
como n-butilamina, trietanolamina o
N-ciclohexildietanolamina,
dibutil-ditiocarbamato de níquel, sales de níquel de
ésteres monoalquílicos, por ejemplo del éster metílico o etílico,
del ácido
4-hidroxi-3,5-di-ter-butil-bencilfosfónico,
complejos de níquel de cetoximas, tal como de
2-hidroxi-4-metilfenilundecil
cetoxima, complejos de níquel de
1-fenil-4-lauroil-5-hidroxipirazol,
con o sin enlaces adicionales.
2.6. aminas estéricamente impedidas, por
ejemplo
bis(2,2,6,6-tetrametil-4-piperidil)sebacato,
bis(2,2,6,6-tetra-metil-4-piperidil)succinato,
bis(1,2,2,6,6-pentametil(4-piperidil)sebacato,
bis(1-octiloxi-2,2,6,6-tetrametil-4-piperidil)-
sebacato, bis(1,2,2,6,6-pentametil-4-piperidil) n-butil-3,5-di-ter-butil-4-hidroxibencilmalonato, el condensado de 1-(2-hidroxietil)-2,2,6,6-tetra-metil-4-hidroxipiperidina y ácido succínico, condensados lineales o cíclicos de N,N'-bis(2,2,6,6-tetrametil-4-piperidil)-hexametilendiamina y 4-ter-octilamino-2,6-di-cloro-1,3,5-triacina, tris(2,2,6,6-tetrametil-4-piperidil)-nitrilo-triacetato, tetrakis (2,2,6,6-tetrametil-4-piperidil)-1,2,3,4-butantetracarboxilato, 1,1'-(1,2-
etandiil)-bis-(3,3,5,5-tetra-metilpiperazinona), 4-benzoil-2,2,6,6-tetra-metilpiperidina, 4-esteariloxi-2,2,6,6-tetrametil-piperidina, bis(1,2,2,6,6-pentametilpiperidil)-2-n-butil-2-(2-hidroxi-3,5-di-ter-butilbencil)-malonato, 3-n-octil-
7,7,9,9-tetrametil-1,3,8-triazaspiro[4.5]-decan-2,4-diona, bis-(1-octiloxi-2,2,6,6-tetrametilpiperidil)-sebacato, bis(1-octiloxi-2,2,6,6-tetrametilpiperidil)succinato, condensados lineales o cíclicos de N,N'-bis-(2,2,6,6-tetrametil-4-piperidil)hexametilendiamina y 4-morfolino-2,6-dicloro-1,3,5-triazina, el condensado de 2-cloro-4,6-bis(4-n-butilamiino-2,2,6,6-tetrametilpiperidil)-1,3,5-triazina y 1,2-bis(3-amino-propilamino)etano, el condensado de 2-cloro-4,6-di-(4-n-butilamino-1,2,2,6,6-pentametilpiperidil)-1,3,5-triacina y 1,2-bis-(3-amino-propilamino)etano, 8-acetil-3-dodecil-7,7,9,9-tetrametil-1,3,8-tri-azaspiro[4.5]decan-2,4-diona, 3-dodecil-1-(2,2,-6,6-tetrametil-4-piperidil)pirrolidin-2,
5-diona, 3-dodecil-1-(1,2,2,6,6-pentametil-4-piperidil)pirrolidin-2,5-diona, una mezcla de 4-hexadeciloxi- y 4-esteariloxi-2,2,6,6-tetrametilpiperidina, un condensado de N,N'-bis(2,2,6,6-tetrametil-4-piperidil)-hexametilendiamina y 4-ciclohexilamino-2,6-dicloro-1,3,5-triazina, un condensado de l,2-bis(3-aminopropilamino)etano y 2,4,6-tricloro-1,3,5-triazina así como 4-butilamino-2,2,6,6-tetrametilpiperidina (CAS Reg. nº [136504-96-6]; un condensado de 1,6-hexandiamina y 2,4,6-tricloro-1,3,5-triacina así como N,N-dibutilamina y 4-butilamino-2,2,6,6-tetrametilpiperidina (CAS Reg. Nº [192268-64-7]); N-(2,2,6,6-tetrametil-4-piperidil)-n-dodecilsuccinimida, N-(1,2,2,6,6-pentametil-4-piperidil)-n-dodecilsuccinimida, 2-undecil-7,7,9,9-tetrametil-1-oxa-3,8-diaza-4-oxo-espiro-[4,5]decano, un producto de reacción de 7,7,9,9-tetrametil-2-ciclo-undecil-1-oxa-3,8-diaza-4-oxospiro[4,5]decano y epiclor-hidrina, 1,1-bis(1,2,2,6,6-pentametil-4-piperidiloxicarbonil)-2-(4-metoxifenil)eteno, N,N'-bis-formil-N,N'-bis-(2,2,6,6-tetra-metil-4-piperidil)hexametilendiamina, diéster de ácido 4-metoximetilenmalónico con 1,2,2,6,6-pentametil-4-hidroxipiperidina, poli[metilpropil-3-oxi-4-(2,2,6,6-tetrametil-4-piperidil)]siloxano, producto de reacción de anhídrido-alfa-ole-
finacopolímero de ácido maleico con 2,2,6,6-tetrametil-4-aminopiperidina o 1,2,2,6,6-pentametil-4-aminopiperidina.
sebacato, bis(1,2,2,6,6-pentametil-4-piperidil) n-butil-3,5-di-ter-butil-4-hidroxibencilmalonato, el condensado de 1-(2-hidroxietil)-2,2,6,6-tetra-metil-4-hidroxipiperidina y ácido succínico, condensados lineales o cíclicos de N,N'-bis(2,2,6,6-tetrametil-4-piperidil)-hexametilendiamina y 4-ter-octilamino-2,6-di-cloro-1,3,5-triacina, tris(2,2,6,6-tetrametil-4-piperidil)-nitrilo-triacetato, tetrakis (2,2,6,6-tetrametil-4-piperidil)-1,2,3,4-butantetracarboxilato, 1,1'-(1,2-
etandiil)-bis-(3,3,5,5-tetra-metilpiperazinona), 4-benzoil-2,2,6,6-tetra-metilpiperidina, 4-esteariloxi-2,2,6,6-tetrametil-piperidina, bis(1,2,2,6,6-pentametilpiperidil)-2-n-butil-2-(2-hidroxi-3,5-di-ter-butilbencil)-malonato, 3-n-octil-
7,7,9,9-tetrametil-1,3,8-triazaspiro[4.5]-decan-2,4-diona, bis-(1-octiloxi-2,2,6,6-tetrametilpiperidil)-sebacato, bis(1-octiloxi-2,2,6,6-tetrametilpiperidil)succinato, condensados lineales o cíclicos de N,N'-bis-(2,2,6,6-tetrametil-4-piperidil)hexametilendiamina y 4-morfolino-2,6-dicloro-1,3,5-triazina, el condensado de 2-cloro-4,6-bis(4-n-butilamiino-2,2,6,6-tetrametilpiperidil)-1,3,5-triazina y 1,2-bis(3-amino-propilamino)etano, el condensado de 2-cloro-4,6-di-(4-n-butilamino-1,2,2,6,6-pentametilpiperidil)-1,3,5-triacina y 1,2-bis-(3-amino-propilamino)etano, 8-acetil-3-dodecil-7,7,9,9-tetrametil-1,3,8-tri-azaspiro[4.5]decan-2,4-diona, 3-dodecil-1-(2,2,-6,6-tetrametil-4-piperidil)pirrolidin-2,
5-diona, 3-dodecil-1-(1,2,2,6,6-pentametil-4-piperidil)pirrolidin-2,5-diona, una mezcla de 4-hexadeciloxi- y 4-esteariloxi-2,2,6,6-tetrametilpiperidina, un condensado de N,N'-bis(2,2,6,6-tetrametil-4-piperidil)-hexametilendiamina y 4-ciclohexilamino-2,6-dicloro-1,3,5-triazina, un condensado de l,2-bis(3-aminopropilamino)etano y 2,4,6-tricloro-1,3,5-triazina así como 4-butilamino-2,2,6,6-tetrametilpiperidina (CAS Reg. nº [136504-96-6]; un condensado de 1,6-hexandiamina y 2,4,6-tricloro-1,3,5-triacina así como N,N-dibutilamina y 4-butilamino-2,2,6,6-tetrametilpiperidina (CAS Reg. Nº [192268-64-7]); N-(2,2,6,6-tetrametil-4-piperidil)-n-dodecilsuccinimida, N-(1,2,2,6,6-pentametil-4-piperidil)-n-dodecilsuccinimida, 2-undecil-7,7,9,9-tetrametil-1-oxa-3,8-diaza-4-oxo-espiro-[4,5]decano, un producto de reacción de 7,7,9,9-tetrametil-2-ciclo-undecil-1-oxa-3,8-diaza-4-oxospiro[4,5]decano y epiclor-hidrina, 1,1-bis(1,2,2,6,6-pentametil-4-piperidiloxicarbonil)-2-(4-metoxifenil)eteno, N,N'-bis-formil-N,N'-bis-(2,2,6,6-tetra-metil-4-piperidil)hexametilendiamina, diéster de ácido 4-metoximetilenmalónico con 1,2,2,6,6-pentametil-4-hidroxipiperidina, poli[metilpropil-3-oxi-4-(2,2,6,6-tetrametil-4-piperidil)]siloxano, producto de reacción de anhídrido-alfa-ole-
finacopolímero de ácido maleico con 2,2,6,6-tetrametil-4-aminopiperidina o 1,2,2,6,6-pentametil-4-aminopiperidina.
La amina estéricamente impedida puede ser
también uno de los compuestos descritos en
GB-A-2 301 106, como componente
Ia), I-b), I-c),
I-d), I-e), I-f),
I-g), I-h), I-i),
I-j), I-k o I-l, en
particular el estabilizador de luz
1-a-1,
1-a-2,
1-b-1,
1-c-1,
1-c-1-,
1-c-2,
1-d-1,
1-d-2,
1-d-3,
1-e-1,
1-f-1,
1-g-1,
1-g-2 o
1-k-1 expuesto en las columnas
68-73 de dicha
GB-A-2 301 106.
La amina estéricamente impedida puede ser uno de
los compeustos descritos en EP-A-0
782 994, por ejemplo los compuestos como se describen en las
reivindicaciones 10 o 38 en los ejemplos 1-12 o
D-1 a D-5 de esta patente.
2.7. Aminas estéricamente impedidas
sustituidas en el átomo de N por un grupo alcoxi
hidroxi-sustituido por ejemplo compuestos tales
como
1-(2-hidroxi-2-metoxilpropoxi)-4-octadecanoiloxi-2,2,6,6-tetrametilpiperidina,
1-(2-hidroxi-2-metilpropoxi)-4-hexadecanoiloxi-2,2,6,6-tetrametilpipe-ridina,
el producto de reacción de
1-oxil-4-hidroxi-2,2,6,6-tetrametilpiperidina
con un radical de carbono de t-amilalcohol,
1-(2-hidroxi-2-metilpropoxi)-4-hidroxi-2,2,6,6-tetrametilpiepridina,
1-(2-hidroxi-2-metilpropoxi)-4-oxo-2,2,6,6-tetrametilpiperidina,
bis(1-(2-hidroxi-2-metilpropoxi)-2,2,6,6-tetrametilpiperidin-4-il)
sebacato,
bis(1-(2-hidroxi-2-metilpropoxi)-2,2,6,6-tetrametilpiepridin-4-il)-adipato,
bis(1-(2-hidroxi-2-metilpropoxi)-2,2,6,6-tetrametilpiperidin-4-il)succinato,
bis(1-(2-hidroxi-2-metilpropoxi)-2,2,6,6-tetrametilpiperidin-4-il)glutarato
y
2,4-bis-{N-[1-(2-hidroxi-2-metilpropoxi)-2,2,6,6-tetrametilpiperidin-4-il]-N-butilamino}-6-(2-hidroxietilamino)-s-triacina.
2.8. Oxamidas por ejemplo
4,4'-dioctiloxioxanilida,
2,2'-dietoxioxanilida,
2,2'-dioctiloxi-5,5'-di-ter-butil
oxanilida,
2,2'-didodeciloxi-5,5'-di-ter-butil
oxanilida,
2-etoxi-2'-etil
oxanilida,
N,N'-bis(3-dimetil-aminopropil)-oxamida,
2-etoxi-5-ter-butil-2'-etil
oxanilida y su mezcla con
2-etoxi-2'-etil-5,4'-di-ter-butil
oxanilida, mezclas de oxanilidas o- y p-metoxi- y
también de o- y
p-etoxi-di-sustituidas.
2.9
2-(2-hidroxifenil)-1,3,5-triacinas,
por ejemplo 2,4,6-tris
(2-hidroxi-4-octiloxifenil)-1,3,5-triacina,
2-(2-hidroxi-4-octiloxifenil)-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina,
2-(2,4-dihidroxifenil)-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina,
2,4-bis(2-hidroxi-4-propiloxifenil)-6-(2,4-dimetilfenil)-1,3,5-triacina,
2-(2-hidroxi-4-octiloxifenil)-4,6-bis-(4-metilfenil)-1,3,5-triacina,
2-(2-hidroxi-4-dodeciloxifenil)-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina,
2-[2-hidroxi-4-trideciloxifenil)-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina,
2-[2-hidroxi-4-(2-hidroxi-3-butiloxipropoxi)fenil]-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina,
2-[2-hidroxi-4-(2-hidroxi-3-butiloxipropoxi)-fenil]-4,6-bis(2,4-dimetil)-1,3,5-triacina,
2-[2-hidroxi-4-(2-hidroxi-3-octiloxipropiloxi)fenil]-4,6-bis(2,4-dimetil)-1,3,5-triacina,
2-[4-(dodeciloxi/trideciloxi-2-hi-
droxipropoxi)-2-hidroxifenil]-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina, 2-[2-hidroxi-4-(2-hidroxi-3-dodeciloxipropoxi)fenil]-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina, 2-(2-hidroxi-4-hexiloxi)fenil-4,6-difenil-1,3,5-triacina, 2-(2-hidroxi-4-metoxifenil)-4,6-difenil-1,3,5-triacina, 2,4,6-tris[2-hidroxi-4-(3-butoxi-2-hidroxi-propoxi)fenil]-1,3,5-triacina, 2-(2-hidroxifenil)-4-(4-metoxifenil)-6-fenil-1,3,5-triacina, 2-{2-hidroxi-4-[3-(2-etilhexil-1-oxi)-2-hidroxipropiloxi]fe-
nil}-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina.
droxipropoxi)-2-hidroxifenil]-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina, 2-[2-hidroxi-4-(2-hidroxi-3-dodeciloxipropoxi)fenil]-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina, 2-(2-hidroxi-4-hexiloxi)fenil-4,6-difenil-1,3,5-triacina, 2-(2-hidroxi-4-metoxifenil)-4,6-difenil-1,3,5-triacina, 2,4,6-tris[2-hidroxi-4-(3-butoxi-2-hidroxi-propoxi)fenil]-1,3,5-triacina, 2-(2-hidroxifenil)-4-(4-metoxifenil)-6-fenil-1,3,5-triacina, 2-{2-hidroxi-4-[3-(2-etilhexil-1-oxi)-2-hidroxipropiloxi]fe-
nil}-4,6-bis(2,4-dimetilfenil)-1,3,5-triacina.
3. Desactivadores metálicos,
por ejemplo N,N'-difeniloxamida,
N-salicilal-N'-saliciloil
hidracina,
N,N'-bis(saliciloil)-hidracina,
N,N'-bis(3,5-di-ter-butil-4-hidroxifenilpropionil)-hidracina,
3-saliciloilamino-1,2,4-triazol,
dihidrazida de ácido bis(benciliden)oxálico,
oxanilida, isoftaloil dihidrazida, sebacoil
bisfenil-hidrazida,
N,N'-diacetiladipoil dihidrazida,
N,N'-bis(saliciloil)oxalil
dihidrazida,
N,N'-bis(saliciloil)-tiopropionoil
dihidrazida.
4. Fosfitos y fosfonitos,
por ejemplo trifenil fosfito, difenil alquil fosfitos, fenil
dialquil fosfitos,
tris(nonil-fenil)fosfito, trilauril
fosfito, trioctadecil fosfito, distearil pentaeritritol difosfito,
tris(2,4-di-ter-butil-fenil)fosfito,
diisodecil pentaeritritol difosfito,
bis(2,4-di-ter-butilfenil)pentaeritritol
difosfito,
bis(2,6-di-ter-butil-4-metilfenil)-pentaeritritol
difosfito, diisodeciloxipentaeritritol difosfito,
bis(2,4-di-ter-butil-6-metilfenil)-pentaeritritol
difosfito,
bis-(2,4,6-tri-ter-butilfenil)pentaeritritol
difosfito, tris-tearil-sorbitol
trifosfito,
tetrakis(2,4-di-ter-butilfenil)-4,4'-difenilen
difosfonito,
6-isooctiloxi-2,4,8,10-tetra-ter-butil-12H-dibenz[d,g]-1,3,2-dioxafosfocina,
6-fluoro-2,4,8,10-tetra-ter-butil-12-metil-dibenz[d,g]-1,3,2-dioxa-fosfocina,
bis(2,4-di-ter-butil-6-metilfenil)metilfosfito,
bis(2,4-di-ter-butil-6-metilfenil)etilfosfito,
2,2',2''-nitrilo[trietil-tris(3,3',5,5'-tetra-ter-butil-1,1'-difenil-2,2'-diil)-fosfito],
2-etilhexil(3,3',5,5'-tetra-ter-butil-1,1'-difenil-2,2'-diil)-fosfito,
5-butil-5-etil-2-(2,4,6-tri-ter-butilfenoxi)-1,3,2-dioxafosfirano.
Se prefiere especialmente los fosfitos
siguientes:
Tris(2,4-di-ter-butilfenil)fosfito
(Irgafos^{R}168, Ciba-Geigy),
tris(nonilfenil)fosfito,
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5. Benzofuranonas e
indolinonas, por ejemplo las descritas en
US-A-432863,
US-A-4338244,
US-A-5175312,
US-A-5216052,
US-A-5252643,
DE-A-4316611,
DE-A-4316622,
DE-A-4316876,
EP-A-0589839 o
EP-A-0591102 o
3-[4-(2-acetoxietoxi)fenil]-5,7-di-ter-butil-benzofuran-2-ona,
5,7-di-ter-butil-3-[4-(2-estearoiloxietoxi)-fenil]benzofuran-2-ona,
3,3'-bis[5,7-di-ter-butil-3-(4-[2-hidroxietoxi]fenil)benzofuran-2-ona],
5,7-di-ter-butil-3-(4-etoxi-fenil)benzofuran-2-ona,
3-(4-acetoxi-3,5-dimetilfenil)-5,7-di-ter-butil-benzofuran-2-ona,
3-(3,5-dimetil-4-pivaloiloxifenil)-5,7-di-ter-butil-benzofuran-2-ona,
3-(3,4-dimetilfenil)-5,7-di-ter-butil-benzofuran-2-ona,
3-(2,3-dimetilfenil)-5,7-di-ter-butil-benzofuran-2-ona.
6. Tiosinergistas, por
ejemplo dilauril tiodipropionato o distearil
tiodipropionato.
7. Captadores de peróxido,
por ejemplo ésteres de ácido beta-tiodipropiónico,
por ejemplo los ésteres de laurilo, estearilo, miristilo o
tridecilo, mercaptobencimidazol o la sal de zinc de
2-mercaptobencimidazol,
dibutilditio-carbamato de zinc, disulfuro de
diotadecilo,
tetrakis(beta-dodecil-mercapto)propionato
de
pentaeritritol.
8. Estabilizadores de
poliamida, por ejemplo sales de cobre en combinación con yoduros
y/o compuestos de fósforo y sales de manganeso
divalente.
9.
Co-estabilizadores básicos, por ejemplo
melamina, polivinilpirrolidona, diciandiamida, trialil cianurato,
derivados de urea, derivados de hidracina, aminas, poliamidas,
poliuretanos, sales de metal alcalino y sales de metal
alcalinotérreo de ácidos grasos superiores, por ejemplo estearato
cálcico, estearato de zinc, behenato de magnesio, estearato de
magnesio, ricinoleato sódico y palmitato potásico, pirocatecolato de
antimonio o pirocatecolato de
zinc.
10. Agentes nucleantes, por
ejemplo sustancias inorgánicas tal como talco, óxidos metálicos
tales como dióxido de titanio u óxido de magnesio, fosfatos,
carbonatos o sulfatos de preferencia de metales alcalinotérreos;
compuestos orgánicos tales como ácidos mono- o policarboxílicos y
sus sales, por ejemplo ácido
4-ter-butilbenzoico, ácido adípico,
ácido difenilacético, succinato sódico o benzoato sódico; compuestos
poliméricos tales como copolímeros iónicos (ionómeros). Se
prefieren especialmente
1,3:2,4-bis(3',4'-dimetilbenciliden)sorbitol,
1,3:2,4-di(parametildibenciliden)sorbitol,
y
1,3:2,4-di(benciliden)sorbitol.
11. Rellenos y agentes de
refuerzo, por ejemplo carbonato cálcico, silicatos, fibras de
vidrio, bulbos de vidrio, asbestos, talco, caolín, mica, sulfato de
bario, óxidos metálicos e hidróxidos, negro de humo, grafito,
harina de madera y harinas o fibras de otros productos naturales,
fibras
sintéticas.
12. Agentes dispersantes,
tal como ceras de óxido de polietileno o aceite
mineral.
13. Otros aditivos, por
ejemplo, plastificantes, lubricantes, emulgentes, pigmentos,
colorantes, aditivos reológicos, catalizadores, agentes de control
de flujo, abrillantadoress ópticos, agentes de deslizamiento,
agentes reticulantes, repetidores de reticulación, captadores de
halógeno, inhibidores de humo, agentes a prueba de llama, agentes
antiestáticos, clarificadores tal como sorbitoles de bisbencilideno
sustituidos y no sustituidos, absorbedores UV de benzoxazinona tal
como
2,2'-p-fenilen-bis(3,1-benzoxazin-4-ona),
antranilamida (AAA), Cyasorb® 3638 (CAS#
18600-59-4), y agentes de
soplado.
Los ejemplos que siguen tienen solo fines
ilustrativos y no deben considerarse que en modo alguno limitan el
alcance del presente invento.
General - pellas de calidad para botella PET se
someten a extrusión para simular la historia térmica que experimenta
el PET cuando se moldea por inyección térmicamente para obtener
preformas de botella y a continuación se moldea por soplado
estirado para formar botellas. La eficacia de un aditivo adiciona
para reducir la formación de acetaldehido se determina mediante
análisis cuantitativo utilizado desorción térmica
GC-MS después de la adopción de métodos publicados.
Se extruye PET no estabilizado cada día para proporcionar un
polímero de control para medir la formación de acetaldehido.
Extrusión - se pre-seca PET en
vacío bajo nitrógeno a una temperatura de horno de alrededor de 70ºC
hasta un nivel de humedad de alrededor de 30 ppm que se verifica
sobre un medidor de humedad Mitsubishi V A-06. Una
extrusora de doble tornillo no inter-engranados,
cogiratorios Leistritz de 18 mm o 27 mm se configura como sigue:
tiempos de fijación : garganta (220-230ºC), zonas y
matriz (270ºC), la temperatura de fusión del extruido actual es de
275-280ºC, tornillo a 100-110 rpm,
alimentador de tolva = 10-15 ppm.
Color de Pella de PET - Indice de
amarilleamiento (YI), y L*, a*, b* mediante ASTM D1925, D65 10degm
especular incluido, medido sobre pellas de PET utilizando un
espectrofotóemtro DCI.
Análisis de acetaldehido - Se determina
cuantitativamente la concentración de acetaldehido en PET utilizando
un método GC-FID de desorción térmica adaptado de
B. Nijassen et al., Packaging Technology and Science, 9, 175
(1996); S. Yong Lee, SPE ANTEC 1997, páginas
857-861; y M. Dong et al., J. Chromatographic
Science, 18, 242 (1980). A continuación se expone un ejemplo
general:
Se analizan muestras de PET, típicamente en
duplicado, pesando 500 mg de pellas de PET en polvo (pulverizado
criogénicamente) en un vial con espacio de cabeza sellado por
roblonado de 5 ml. El vial de muestra se calienta a 120ºC durante
una hora en un analizador de espacio de cabeza estático Tekmar
modelo 5000. El gas del espacio de cabeza (5 cc) se transfiere
luego vía un conducto de transferencia a un sistema Fisons
MD-800 GC-MS para detección de SIR
del acetaldehido. El acetaldehido se detecta controlando sus iones
de fragmento de 29 y 44 m/e. La corriente de iones total (TIC) del
GC-MS se controla también en la región de tiempo de
retención de 4-8 minutos. Procediendo de este modo
se confirma la presencia de acetaldehido mediante tres detectores
diferentes. Con el empleo de un valor de acetaldehido conocido
para PET, se compara la relación de áreas pico para la resina de
PET conocida y para las mezclas de resina de PET experimental y
puede obtenerse la cantidad de acetaldehido en la mezcla
experimental.
Turbidez - Las mezclas de PET se moldean por
inyección para formar placas de 2'' x 2'' x 60 mil utilizando un
moldeador de inyección BOY 50M a una temperatura de matriz de 550ºF
(288ºC). Se utiliza un medidor de turbidez
BYK-Gardner para medir la turbidez. "Turbidez"
es un efecto de agrisado perceptible indeseado.
Se utiliza PET comercial no estabilizado
(CLEARTUF® 7207 Shell) como un PET de control. Varias
combinaciones de aditivos expuestas a continuación demuestran una
reducción significante en la cantidad de acetaldehido (AA) frente
la cantidad apreciada cuando PET no estabilizado se compone mediante
extrusión. La reducción de AA% es la cantidad menos comparado con
la cantidad de AA en el control. Los datos de corriente de iones
total (TIC) se exponen en triplicado para el PET de control que
tiene una desviación estandard de s = 0,35. Partes por millón (ppm)
de aditivo basado en la resina.
\newpage
Formulación | Aditivos |
A (control) | ninguno |
B | 2500 ppm de poliacrilamida, Percol® 333 |
(Ciba) 400 ppm de poli(vinil alcohol), PVA | |
C | 2500 ppm de poliacrilamida, Percol® 333 |
(Ciba) 1600 ppm de celulosa | |
D | 400 ppm de poli(vinil alcohol), PVA |
1600 ppm de celulosa | |
E | 2500 ppm de poliacrilamida, Percol® 351 |
(Ciba) 400 ppm de poli(vinil alcohol), PVA | |
F | 2500 ppm de poliacrilamida, Percol® 333 |
(Ciba) 400 ppm de poli(vinil alcohol), PVA | |
1600 ppm de celulosa | |
G | 750 ppm de copolímero de etilen/vinil |
alcohol, 40% de etileno | |
2000 ppm de almidón | |
H | 750 ppm de copolímero de etilen/vinil |
alcohol, 40% de etileno | |
1000 ppm de almidón | |
1000 ppm de celulosa. |
El uso de las presentes combinaciones de
aditivos resulta en la reducción de acetaldehido frente al control
y proporciona excelente control de color y baja formación de
turbidez.
Cuando se intercambia poliacrilamida, Percol
333^{®} o Percol 351^{®} en las formulaciones anteriores se
aprecian excelentes resultados para inhibición de aldehido, bajo
color y baja turbidez. Cuando se intercambia almidón y celulosa en
las formulaciones anteriores, se aprecian excelentes resultados para
inhibición de aldehído, bajo color y baja turbidez. Cuando se
intercambia, en las formulaciones anteriores, poli(vinil
alcohol), PVA, copolímero de etilen/vinil alcohol, 40%, 38%, 32% o
27%, se aprecian excelentes resultados para inhibición de aldehído,
bajo color y baja turbidez.
Claims (8)
1. Una composición poliéster, estabilizada
frente a la formación de contaminantes aldehídicos durante el
proceso en fusión de dicha composición, que comprende
- (a)
- un poliéster, y
- (b)
- una cantidad estabilizante efectiva de una combinación de aditivos, en donde los aditivos se eligen entre dos grupos diferentes, en donde los grupos son
- (ii.)
- alcoholes polihídricos que se eligen del grupo constituido por almidón, celulosa, azúcar o alcohol de azúcar, trimetilol propano, trietilol propano, glicerol, sorbitol, pentaeritritol o dipentaeritritol, almidón degradado (dextrinas y ciclodextrinas), maltosa y sus derivados, maltitol, hidrato de maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de maltulosa, D,L-glucosa, dextrosa, sucrosa y D-mannitol, y
- (iii.)
- poliacrilamida, polimetacrilamida o un copolímero de acrilamida o metacrilamida con por lo menos un comonómero etilénicamente insustituido.
2. Una composición, de conformidad con la
reivindicación 1, en donde el poliéster del componente (a) es 95 –
99,9% en peso de la composición estabilizada; y la combinación de
aditivos del componente (b) es de 5 a 0,1% en peso de la
composición estabilizada.
3. Una composición, de conformidad con la
reivindicación 1, en donde el poliéster del componente (a) es
poli(etilen tereftalato) o poli(etilen
2,6-naftalen-2,6-dicarboxilato.
4. Una composición, de conformidad con la
reivindicación 1, en donde el aditivo del grupo (iii.) es
poliacrilamida, polimetacrilamida o un copolímero de acrilamida o
metacrilamida con otro monómero etilénicamente insaturado que es
acrilamida, metacrilamida, estireno, etileno, un alquil acrilato, un
alquil metacrilato,
N-vinil-2-pirrolidinona
o acrilonitrilo.
5. Un procedimiento para prevenir la formación
de contaminantes aldehídicos durante el proceso de fusión de un
poliéster que comprende incorporar en dicho poliéster una cantidad
estabilizante efectiva de una combinación de aditivos, en donde los
aditivos se eligen entre dos grupos diferentes, en donde los grupos
son (ii.) alcoholes polihídricos que se eligen del grupo
constituido por almidón, celulosa, un azúcar o alcohol de azúcar,
trimetilol propano, trietilol propano, glicerol, sorbitol,
pentaeritritol o dipentaeritritol, almidón degradado (dextrinas y
ciclodextrinas), maltosa y sus derivados, maltitol, hidrato de
maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de
maltulosa, D,L-glucosa, dextrosa, sucrosa y
D-mannitol, y (iii.) poliacrilamida,
polimetacrilamida o un copolímero de acrilamida o metacrilamida con
por lo menos un comonómero etilénicamente no sustituido.
6. Un contenedor o película de plástico mono- o
multi-capa estabilizado frente a la formación de
contaminantes aldehídicos durante el proceso en fusión de dicha
composición, que comprende
- (a)
- un poliéster, y
- (b)
- una cantidad estabilizante efectiva de una combinación de aditivos, en donde los aditivos se eligen entre dos grupos diferentes, en donde los grupos son
- (ii.)
- alcoholes polihídricos que se eligen del grupo constituido por almidón, celulosa, azúcar o alcohol de azúcar, trimetilol propano, trietilol propano, glicerol, sorbitol, pentaeritritol o dipentaeritritol, almidón degradado (dextrinas y ciclodextrinas), maltosa y sus derivados, maltitol, hidrato de maltopentaosa, maltoheptaosa, maltotetraosa, monohidrato de maltulosa, D,L-glucosa, dextrosa, sucrosa y D-mannitol, y
- (iii.)
- poliacrilamida, polimetacrilamida o un copolímero de acrilamida o metacrilamida con por lo menos un comonómero etilénicamente insustituido.
7. Un contenedor de plástico mono- o multicapa
de conformidad con la reivindicación 6 que es una botella
rígida.
8. Uso del componente (b) de conformidad con la
reivindicación 1 para prevenir la formación de contaminantes
aldehídicos durante el proceso d fusión de un poliéster.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25914000P | 2000-12-29 | 2000-12-29 | |
US259140P | 2000-12-29 | ||
US28792501P | 2001-04-30 | 2001-04-30 | |
US287925P | 2001-04-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES2279791T3 true ES2279791T3 (es) | 2007-09-01 |
Family
ID=26947110
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES01272651T Expired - Lifetime ES2279791T3 (es) | 2000-12-29 | 2001-12-19 | Composiciones de poliester de bajo contenido de aldehido residual. |
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---|---|
US (1) | US6790499B2 (es) |
EP (1) | EP1355986B1 (es) |
JP (1) | JP2004517187A (es) |
AT (1) | ATE352583T1 (es) |
CA (1) | CA2433126C (es) |
DE (1) | DE60126340T2 (es) |
ES (1) | ES2279791T3 (es) |
TW (1) | TWI268948B (es) |
WO (1) | WO2002053643A1 (es) |
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-
2001
- 2001-12-19 DE DE60126340T patent/DE60126340T2/de not_active Expired - Lifetime
- 2001-12-19 AT AT01272651T patent/ATE352583T1/de not_active IP Right Cessation
- 2001-12-19 WO PCT/EP2001/015011 patent/WO2002053643A1/en active IP Right Grant
- 2001-12-19 EP EP01272651A patent/EP1355986B1/en not_active Expired - Lifetime
- 2001-12-19 ES ES01272651T patent/ES2279791T3/es not_active Expired - Lifetime
- 2001-12-19 CA CA2433126A patent/CA2433126C/en not_active Expired - Fee Related
- 2001-12-19 JP JP2002555161A patent/JP2004517187A/ja active Pending
- 2001-12-20 US US10/034,048 patent/US6790499B2/en not_active Expired - Fee Related
- 2001-12-27 TW TW090132494A patent/TWI268948B/zh not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US20020137856A1 (en) | 2002-09-26 |
JP2004517187A (ja) | 2004-06-10 |
CA2433126C (en) | 2010-04-06 |
ATE352583T1 (de) | 2007-02-15 |
US6790499B2 (en) | 2004-09-14 |
DE60126340T2 (de) | 2007-11-08 |
EP1355986B1 (en) | 2007-01-24 |
EP1355986A1 (en) | 2003-10-29 |
TWI268948B (en) | 2006-12-21 |
CA2433126A1 (en) | 2002-07-11 |
DE60126340D1 (de) | 2007-03-15 |
WO2002053643A1 (en) | 2002-07-11 |
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