US2011086998A1PendingUtilityA1
An aliphatic polyester resin and a process for producing it
Est. expiryJul 24, 2028(~2 yrs left)· nominal 20-yr term from priority
C09J 167/04C08G 63/6922
58
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Claims
Abstract
The present invention is an aliphatic polyester resin in which a polyhydroxy acid skeleton is a main component, manufactured using a polymerization catalyst, characterized in that a specific organophosphorus compound is copolymerized in the resin. Activity of the polymerization catalyst contained in the aliphatic polyester resin of the present invention after the polymerization is well lowered and a lactide is hardly produced even by heating after the polymerization or after the manufacture.
Claims
exact text as granted — not AI-modified1 . An aliphatic polyester resin in which a polyhydroxy acid skeleton is a main component, manufactured using a polymerization catalyst, characterized in that an organophosphorus compound represented by the formula [I] is copolymerized in the resin.
In the formula, R 1 , R 2 , R 3 and R 4 are same or different and each of them is hydrogen or alkyl group; and n is an integer of 1 or more.
2 . The aliphatic polyester resin according to claim 1 , wherein the polyhydroxy acid is polylactic acid and said polylactic acid is bonded to at least one of R 1 , R 2 and R 3 in the organophosphorus compound.
3 . The aliphatic polyester resin according to claim 2 , wherein polylactic acid is bonded to R 3 of the organophosphorus compound.
4 . The aliphatic polyester resin according to claim 1 , wherein the molar ratio of phosphorus element (A) derived from the organophosphorus compound to metal element (B) derived from the polymerization catalyst in the resin satisfies the following relation.
1
≦
Phosphorus
element
(
A
)
derived
from
the
organophosphorus
compound
Metal
element
(
B
)
derived
from
the
polymerization
catalyst
≦
30
5 . An adhesive characterized in that the aliphatic polyester resin of claim 1 is used.
6 . A process for producing an aliphatic polyester resin where a polyhydroxy acid skeleton is a main component by means of a ring-opening polymerization reaction in the presence of a polymerization catalyst, characterized in that an organophosphorus compound represented by the formula [I] is added to the reaction system to lower the activity of the polymerization catalyst.
In the formula, R 1 , R 2 , R 3 and R 4 are same or different and each of them is hydrogen or alkyl group; and n is an integer of 1 or more.
7 . The process according to claim 6 , wherein the organophosphorus compound is added to the reaction system before initiation of the ring-opening polymerization reaction.
8 . The aliphatic polyester resin according to claim 2 , wherein the molar ratio of phosphorus element (A) derived from the organophosphorus compound to metal element (B) derived from the polymerization catalyst in the resin satisfies the following relation.
1
≦
Phosphorus
element
(
A
)
derived
from
the
organophosphorus
compound
Metal
element
(
B
)
derived
from
the
polymerization
catalyst
≦
30
9 . The aliphatic polyester resin according to claim 3 , wherein the molar ratio of phosphorus element (A) derived from the organophosphorus compound to metal element (B) derived from the polymerization catalyst in the resin satisfies the following relation.
1
≦
Phosphorus
element
(
A
)
derived
from
the
organophosphorus
compound
Metal
element
(
B
)
derived
from
the
polymerization
catalyst
≦
30
10 . An adhesive characterized in that the aliphatic polyester resin of claim 2 is used.
11 . An adhesive characterized in that the aliphatic polyester resin of claim 3 is used.
12 . An adhesive characterized in that the aliphatic polyester resin of claim 4 is used.Join the waitlist — get patent alerts
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