US3873476A — Hydrophilic polyurethane foam

Claim 1

Independent Claim 64 words

AN OPEN-CELLED, HYDROPHILIC POLYURETHANE FOAM HAVING A DENSITY FROM ABOUT 15 TO ABOUT 40 KG/M3, A COMPRESSION STRENGTH OF AT LEAST ABOUT 300 P/CM2 AND A WATER RETENTION CAPACITY OF AT LEAST ABOUT 60 VOL %, WHICH POLYURETHANE FOAM IS OBTAINED FROM THE REACTION OF ALIPHATIC POLYHYDROXYL COMPOUNDS AND A POLYISOCYANATE WHILE IN ADMIXTURE WITH A NONSILICON CONTAINING EMULSIFER AND A BLOWING AGENT WHERE:

Claim 2

Dependent Claim 64 words

AN OPEN-CELLED, HYDROPHILIC POLYURETHANE FOAM HAVING A DENSITY FROM ABOUT 15 TO ABOUT 40 KG/M3, A COMPRESSION STRENGTH OF AT LEAST ABOUT 300 P/CM2 AND A WATER RETENTION CAPACITY OF AT LEAST ABOUT 60 VOL %, WHICH POLYURETHANE FOAM IS OBTAINED FROM THE REACTION OF ALIPHATIC POLYHYDROXYL COMPOUNDS AND A POLYISOCYANATE WHILE IN ADMIXTURE WITH A NONSILICON CONTAINING EMULSIFER AND A BLOWING AGENT WHERE:

Claim 3

Dependent Claim 42 words

THE POLYHYDROXYL COMPOUNDS ARE A MIXTURE OF A. FROM ABOUT 50 TO ABOUT 90% BY WEIGHT, BASED UPON THE TOTAL QUANTITY OF POLYHYDROXYL COMPOUNDS, OF A POLYHYDROXYL COMPOUND WHICH HAS AN OH-NUMBER FROM ABOUT 300 TO ABOUT 1820 AND WHICH HAS EITHER

Claim 4

Dependent Claim 42 words

THE POLYHYDROXYL COMPOUNDS ARE A MIXTURE OF A. FROM ABOUT 50 TO ABOUT 90% BY WEIGHT, BASED UPON THE TOTAL QUANTITY OF POLYHYDROXYL COMPOUNDS, OF A POLYHYDROXYL COMPOUND WHICH HAS AN OH-NUMBER FROM ABOUT 300 TO ABOUT 1820 AND WHICH HAS EITHER

Claim 5

Dependent Claim 15 words

AT LEAST ABOUT 50% OF THE HYDROXYL GROUPS IN THE FORM OF PRIMARY HYDROXYL GROUPS,

Claim 6

Dependent Claim 15 words

AT LEAST ABOUT 50% OF THE HYDROXYL GROUPS IN THE FORM OF PRIMARY HYDROXYL GROUPS,

Claim 7

Dependent Claim 7 words

TERTIARY AMINO GROUPS IN THE MOLECULE, OR

Claim 8

Dependent Claim 7 words

TERTIARY AMINO GROUPS IN THE MOLECULE, OR

Claim 9

Dependent Claim 50 words

AT LEAST 50 MOL % OF SAID POLYISOCYANATE CONTAINS BIURET GROUPS AND SAID POLYISOCYANATE IS PRESENT IN A QUANTITY WHICH CORRESPONDS TO FROM ABOUT 35 TO ABOUT 70% OF THE QUANTITY THEORETICALLY REQUIRED FOR REACTING WITH ALL OF THE ACTIVE HYDROGEN ATOMS IN THE REACTION MIXTURE WITH ISOCYANATE GROUPS; AND

Claim 10

Dependent Claim 50 words

AT LEAST 50 MOL % OF SAID POLYISOCYANATE CONTAINS BIURET GROUPS AND SAID POLYISOCYANATE IS PRESENT IN A QUANTITY WHICH CORRESPONDS TO FROM ABOUT 35 TO ABOUT 70% OF THE QUANTITY THEORETICALLY REQUIRED FOR REACTING WITH ALL OF THE ACTIVE HYDROGEN ATOMS IN THE REACTION MIXTURE WITH ISOCYANATE GROUPS; AND

Claim 11

Dependent Claim 7 words

tertiary amino groups in the molecule, or

Claim 12

Dependent Claim 7 words

tertiary amino groups in the molecule, or

Claim 13

Dependent Claim 54 words

The composition of claim 1 wherein the polyhydroxyl compound (1 a) is used in a quantity from about 60 to about 80% by weight based on the total hydroxyl component, and the polyhydroxyl compound (1 b) is used in quantity from about 20 to about 40% by weight based upon the total hydroxyl component.

Claim 14

Dependent Claim 50 words

at least 50 mol % of said polyisocyanate contains biuret groups and said polyisocyanate is present in a quantity which corresponds to from about 35 to about 70% of the quantity theoretically required for reacting with all of the active hydrogen atoms in the reaction mixture with isocyanate groups; and

Claim 15

Dependent Claim 50 words

at least 50 mol % of said polyisocyanate contains biuret groups and said polyisocyanate is present in a quantity which corresponds to from about 35 to about 70% of the quantity theoretically required for reacting with all of the active hydrogen atoms in the reaction mixture with isocyanate groups; and

Claim 16

Dependent Claim 42 words

where the emulsifier is selected from the group consisting of neutral and ionic emulsifiers which increase the hydrophilic character of the foam and is present in a quantity from about 2 to about 20% by weight based upon the total reaction mixture.

Claim 17

Dependent Claim 42 words

where the emulsifier is selected from the group consisting of neutral and ionic emulsifiers which increase the hydrophilic character of the foam and is present in a quantity from about 2 to about 20% by weight based upon the total reaction mixture.

Claim 18

Dependent Claim 28 words

The composition of claim 1 wherein at least about 50% of the hydroxyl groups in the polyhydroxyl compound (1 b) are in the form of secondary hydroxyl groups.

Claim 19

Dependent Claim 76 words

both 50% primary hydroxyl groups and tertiary amino groups, and b. from about 50 to about 10% by weight, based upon the total quantity of polyhydroxyl compounds, of a polyhydroxyl polyether compound which is free from amine nitrogen atoms, which has an OH-number from about 25 to about 250, which contains at least about 20 mol % of ethylene oxide units and in which at least about 40% of the hydroxyl groups are secondary hydroxyl groups;

Claim 20

Dependent Claim 76 words

both 50% primary hydroxyl groups and tertiary amino groups, and b. from about 50 to about 10% by weight, based upon the total quantity of polyhydroxyl compounds, of a polyhydroxyl polyether compound which is free from amine nitrogen atoms, which has an OH-number from about 25 to about 250, which contains at least about 20 mol % of ethylene oxide units and in which at least about 40% of the hydroxyl groups are secondary hydroxyl groups;

Claim 21

Dependent Claim 40 words

WHERE THE EMULSIFIER FROM THE GROUP CONSISTING OF NEUTRAL AND IONIC EMULSIFIERS WHICH INCREASE THE HYDROPHILIC CHARACTER OF THE FOAM AND IS PRESENT IN A QUANTITY FROM ABOUT 2 TO ABOUT 20% BY WEIGHT BASED UPON THE TOTAL REACTION MIXTURE.

Claim 22

Dependent Claim 40 words

WHERE THE EMULSIFIER FROM THE GROUP CONSISTING OF NEUTRAL AND IONIC EMULSIFIERS WHICH INCREASE THE HYDROPHILIC CHARACTER OF THE FOAM AND IS PRESENT IN A QUANTITY FROM ABOUT 2 TO ABOUT 20% BY WEIGHT BASED UPON THE TOTAL REACTION MIXTURE.

Claim 23

Dependent Claim 76 words

BOTH 50% PRIMARY HYDROXYL GROUPS AND TERTIARY AMINO GROUPS, AND B. FROM ABOUT 50 TO ABOUT 10% BY WEIGHT, BASED UPON THE TOTAL QUANTITY OF POLYHYDROXYL COMPOUNDS, OF A POLYHYDROXYL POLYETHER COMPOUND WHICH IS FREE FROM AMINE NITROGEN ATOMS, WHICH HAS AN OH-NUMBER FROM ABOUT 25 TO ABOUT 250, WHICH CONTAINS AT LEAST ABOUT 20 MOL % OF ETHYLENE OXIDE UNITS AND IN WHICH AT LEAST ABOUT 40% OF THE HYDROXYL GROUPS ARE SECONDARY HYDROXYL GROUPS;

Claim 24

Dependent Claim 76 words

BOTH 50% PRIMARY HYDROXYL GROUPS AND TERTIARY AMINO GROUPS, AND B. FROM ABOUT 50 TO ABOUT 10% BY WEIGHT, BASED UPON THE TOTAL QUANTITY OF POLYHYDROXYL COMPOUNDS, OF A POLYHYDROXYL POLYETHER COMPOUND WHICH IS FREE FROM AMINE NITROGEN ATOMS, WHICH HAS AN OH-NUMBER FROM ABOUT 25 TO ABOUT 250, WHICH CONTAINS AT LEAST ABOUT 20 MOL % OF ETHYLENE OXIDE UNITS AND IN WHICH AT LEAST ABOUT 40% OF THE HYDROXYL GROUPS ARE SECONDARY HYDROXYL GROUPS;

Claim 25

Dependent Claim 23 words

The composition of claim 1 wherein the polyhydroxyl compound (1 b) contains from about 40 to about 60 mol % of ethylene oxide.

Claim 26

Dependent Claim 13 words

A substrate for cut flower arrangement comprising the polyurethane foam of claim 1.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-03-24	1978-09-23	1979-03-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-03-24	1982-09-23	1983-03-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-03-24	1986-09-23	1987-03-25	$7700.00	Window Closed / Lapsed

Hydrophilic polyurethane foam

Abstract

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