USRE32472E - Flame-retardant polymer compositions containing amine salts - Google Patents

Flame-retardant polymer compositions containing amine salts Download PDF

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Publication number
USRE32472E
USRE32472E US06/596,128 US59612884A USRE32472E US RE32472 E USRE32472 E US RE32472E US 59612884 A US59612884 A US 59612884A US RE32472 E USRE32472 E US RE32472E
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flame
composition
polymer
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US06/596,128
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Yuval Halpern
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Borg Warner Corp
GE Specialty Chemicals Inc
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Borg Warner Chemicals Inc
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Priority claimed from US06/279,634 external-priority patent/US4365033A/en
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Publication of USRE32472E publication Critical patent/USRE32472E/en
Assigned to GE SPECIALTY CHEMICALS, INC. reassignment GE SPECIALTY CHEMICALS, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 03/09/1989 Assignors: BORG-WARNER SPECIALTY CHEMICALS, INC.
Assigned to BORG-WARNER SPECIALTY CHEMICALS, INC. reassignment BORG-WARNER SPECIALTY CHEMICALS, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 01/25/1988 Assignors: BW - SPECIALTY CHEMICALS CORPORATION
Assigned to BORG-WARNER CORPORATION reassignment BORG-WARNER CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: BORG-WARNER CHEMICALS, INC., A CORP. OF DE (MERGING)
Assigned to GE SPECIALTY CHEMICALS, INC. (FORMERLY KNOWN AS BORG-WARNER SPECIALTY CHEMICALS, INC. AND BEFORE THAT KNOWN AS BW-SPECIALTY CHEMICALS CORPORATION), A DE CORP. reassignment GE SPECIALTY CHEMICALS, INC. (FORMERLY KNOWN AS BORG-WARNER SPECIALTY CHEMICALS, INC. AND BEFORE THAT KNOWN AS BW-SPECIALTY CHEMICALS CORPORATION), A DE CORP. MERGER: BORG-WARNER CHEMICALS, INC. INTO BORG-WARNER CORPORATION; AND AN ASSIGNMENT OF BORG-WARNER CORPORATION TO BW-SPECIALITY CHEMICALS CORPORATION; AND A CHANGE OF NAME FROM BW-SPECIALITY CHEMICALS CORPORATION TO BORG-WARNER CHEMICALS,INC.; AND CHANGE OF NAME FROM BORG-WARNER CHEMICALS, INC. TO GE SOECIALITY CHEMICALS, INC.; SEE RECORD FOR DETAILS. Assignors: BORG-WARNER CORPORATION (SURVIVING CORPORATION OF A MERGER WITH BORG-WARNER CHEMICALS, INC.)
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    • 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
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/527—Cyclic esters

Definitions

  • This invention relates as indicated to certain flame-retardant polymer compositions and, more particularly, to such compositions which owe their flame-retardant properties to the presence of small proportions of amine or metal salts, more particularly defined hereinafter.
  • Polymers vary widely in their resistance to burning. Some, such as the polyolefins, polystyrene, polyalkyl acrylates and methacrylates, and the like, burn readily. Polytetrafluoroethylene, polyvinylidene chloride and polyvinyl chloride, on the other hand, have a rather high resistance to burning. In any event, it obviously is highly desirable that, for certain applications, a polymer should have a high degree of flame retardance so that it will meet the requirements of various building codes or that it will meet safety standards imposed on toys, carpeting, drapery materials, automotive applications, etc.
  • the formulator's goal, in preparing a flame-retardant polymer composition, is to add just enough of the flame retardant compound so as to provide the desired degree of flame retardance, but no more than this minimum amount, so as to preserve as much as possible the advantageous properties of the polymer. Frequently, it is not possible to select a flame-retardant which will meet these requirements satisfactorily.
  • U.S. Pat. No. 4,041,012 shows the use of acrylate esters of dihaloneopentylglycol phosphates as flame-retardant additives in acrylic polymer compositions.
  • the esters are incorporated in polyacrylate compositions by copolymerization with methyl methacrylate, for example, although at column 7, lines 15-59, it is stated that they may be used in combination with known synergists in other types of polymers "such as polystyrene" (see line 37).
  • the present invention is a composition
  • a composition comprising a normally flammable polymer and a minor proportion, sufficient to impart flame-retardant properties to said composition, of a salt of 5,5-bis(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane having the structure ##STR1## where A is a polyvalent metal or amine group and n is an integer corresponding to the valence of A.
  • Polyvalent metals contemplated above include aluminum, calcium, magnesium, barium, chromium, strontium, silver, titanium, nickel, copper, zinc, iron, cobalt, manganese, molybdenum, zirconium, cadmium, bismuth, lead, tin, vanadium, antimony, etc.
  • Aluminum and calcium are preferred.
  • the amine preferably is an amino-s-triazine. Melamine is especially preferred.
  • the polyvalent metal and amine salts herein may be prepared by reacting the corresponding acid or the acid chloride thereof with a polyvalent metal halide, a basic polyvalent metal base, or amine.
  • a polyvalent metal halide a polyvalent metal halide
  • a basic polyvalent metal base or amine.
  • the process is described in more detail in an application for patent, Ser. No. 279,636, entitled “Salts of 5,5-Bis-(Bromomethyl)-2-Hydroxy-2-Oxo-1,3,2-Dioxaphosphorinane and Process for Preparing Same," filed concurrently herewith.
  • Ser. No. 279,636 entitled “Salts of 5,5-Bis-(Bromomethyl)-2-Hydroxy-2-Oxo-1,3,2-Dioxaphosphorinane and Process for Preparing Same," filed concurrently herewith.
  • the subject matter of that application is incorporated herewith by reference.
  • Preparation of the flame-retardant compositions of this invention may be accomplished by mixing the ingredients in an electrically heated Brabender head for about 10 minutes at 200° C. and 60 rpm.
  • the test specimens for which data is shown in the Table are prepared from compression molded slabs.
  • the flame retardance of a plastic material can be determined by means of Underwriters Laboratories Test UL-94.
  • the test specimen measures 5" ⁇ 0.5" ⁇ 0.125"; it is suspended vertically at a measured height above the flame from a Bunsen burner. After 10 seconds the flame again is removed and the duration of the flaming of the test specimen is noted. Immediately, the flame is placed again under the specimen and after 10 seconds the flame again is withdrawn and the duration of flaming and glowing is noted. Five test specimens are thus tested and the results of all five test are considered in the determination of a rating for the plastic material.
  • duration of flaming after first flame application (2) duration of flaming after second flame application; (3) duration of flaming plus glowing after second flame application; (4) whether or not specimens burn up to their point of suspension; and (5) whether or not specimens drip flaming particles which ignite a cotton swatch placed 12 inches beneath the test specimen.
  • the highest rating given to a material is "V-0".
  • V-1 The next highest rating is "V-1". It indicates that (1) no specimen burns with flaming combustion for more than 30 seconds after each application of the test flame; (2) the material does not have a flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of 5 specimens; (3) no specimen burns with flaming or glowing combustion up to the holding clamp; (4) no specimen drips flaming particles that ignite the dry surgical cotton beneath the specimen; and (5) no specimen glows for more than 60 seconds after the second removal of the flame.
  • a "V-2" rating is given to a composition (1) when no specimen burns with flaming combustion for more than 30 seconds after each application of the test flame; (2) it does not have a total flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of 5 specimens; (3) no specimen burns with flaming or glowing combustion up to the holding clamp; (4) some specimens drip flaming particles which burn only briefly, some of which ignite the dry cotton beneath the specimen; and (5) no specimen glows for more than 60 seconds after the second removal of the flame.
  • NSE non-self-extinguishing
  • Another test for the flammability of a plastic material measures the minimum concentration of oxygen that will just support combustion.
  • the test is an ASTM test, D 2863-70. It is carried out in a glass column wherein the concentration of oxygen is varied until that concentration is found which will just support the burning of a test specimen, for 3 minutes or until 50 mm of the specimen has burned.
  • the test specimen is 70-150 mm long by 6.5 mm wide by 3.0 mm thick. This concentration of oxygen is called the oxygen index.
  • a high oxygen index (O.I.) indicates a highly flame-retardant specimen.
  • the metal or amine salt additives herein should ordinarily be used in concentrations ranging from about 20 pph (parts per hundred parts of resin) to about 32 pph.
  • antimony trioxide may be used as a synergist in concentrations ranging from about 2 pph to about 12 pph.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Polymer compositions containing minor proportions of polyvalent metal or amine salts of 5,5-bis-(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane. Aluminum, calcium and melamine salts are preferred.

Description

This invention relates as indicated to certain flame-retardant polymer compositions and, more particularly, to such compositions which owe their flame-retardant properties to the presence of small proportions of amine or metal salts, more particularly defined hereinafter.
BACKGROUND OF THE INVENTION
Polymers vary widely in their resistance to burning. Some, such as the polyolefins, polystyrene, polyalkyl acrylates and methacrylates, and the like, burn readily. Polytetrafluoroethylene, polyvinylidene chloride and polyvinyl chloride, on the other hand, have a rather high resistance to burning. In any event, it obviously is highly desirable that, for certain applications, a polymer should have a high degree of flame retardance so that it will meet the requirements of various building codes or that it will meet safety standards imposed on toys, carpeting, drapery materials, automotive applications, etc.
The treatment of these more flammable polymers to increase their resistance to burning is well known; such treatment generally has involved the incorporation in the polymer composition of substantial proportions of antimony oxide, halogenated hydrocarbons and low molecular weight phosphate esters. Ordinarily, though, the effective use of these and other additives has required their presence in such high concentrations as to adversely affect the desirable properties of the polymer. Thus, such desirable properties as hardness, clarity, strength, elasticity, etc., are diminished significantly by the presence of large amounts of a flame-retardant chemical.
The formulator's goal, in preparing a flame-retardant polymer composition, is to add just enough of the flame retardant compound so as to provide the desired degree of flame retardance, but no more than this minimum amount, so as to preserve as much as possible the advantageous properties of the polymer. Frequently, it is not possible to select a flame-retardant which will meet these requirements satisfactorily.
U.S. Pat. No. 3,877,655 (Shim) shows the use of phosphoramidate esters of dibromoneopentylglycol as flame-retardant additives in a wide variety of polymer compositions. The phosphoramidate for which flame-retardant test data is shown is the N,N'-dimethylamide.
U.S. Pat. No. 4,041,012 (Albright et al.) shows the use of acrylate esters of dihaloneopentylglycol phosphates as flame-retardant additives in acrylic polymer compositions. The esters are incorporated in polyacrylate compositions by copolymerization with methyl methacrylate, for example, although at column 7, lines 15-59, it is stated that they may be used in combination with known synergists in other types of polymers "such as polystyrene" (see line 37).
The preparation of the calcium salt of pentaerythritoldiiodohydrin phosphoric acid is shown in "Iodine-Containing Aliphatic Phosphoric Esters," Eidenbenz et al., Arch. Pharm. 280, 227-31 (1942).
SUMMARY OF THE INVENTION
The present invention is a composition comprising a normally flammable polymer and a minor proportion, sufficient to impart flame-retardant properties to said composition, of a salt of 5,5-bis(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane having the structure ##STR1## where A is a polyvalent metal or amine group and n is an integer corresponding to the valence of A.
DETAILED DESCRIPTION OF THE INVENTION
Polyvalent metals contemplated above include aluminum, calcium, magnesium, barium, chromium, strontium, silver, titanium, nickel, copper, zinc, iron, cobalt, manganese, molybdenum, zirconium, cadmium, bismuth, lead, tin, vanadium, antimony, etc. Aluminum and calcium are preferred.
The amine preferably is an amino-s-triazine. Melamine is especially preferred.
The polyvalent metal and amine salts herein may be prepared by reacting the corresponding acid or the acid chloride thereof with a polyvalent metal halide, a basic polyvalent metal base, or amine. The process is described in more detail in an application for patent, Ser. No. 279,636, entitled "Salts of 5,5-Bis-(Bromomethyl)-2-Hydroxy-2-Oxo-1,3,2-Dioxaphosphorinane and Process for Preparing Same," filed concurrently herewith. The subject matter of that application is incorporated herewith by reference.
Preparation of the flame-retardant compositions of this invention (for test purposes) may be accomplished by mixing the ingredients in an electrically heated Brabender head for about 10 minutes at 200° C. and 60 rpm. The test specimens for which data is shown in the Table are prepared from compression molded slabs.
The flame retardance of a plastic material can be determined by means of Underwriters Laboratories Test UL-94. The test specimen measures 5"×0.5"×0.125"; it is suspended vertically at a measured height above the flame from a Bunsen burner. After 10 seconds the flame again is removed and the duration of the flaming of the test specimen is noted. Immediately, the flame is placed again under the specimen and after 10 seconds the flame again is withdrawn and the duration of flaming and glowing is noted. Five test specimens are thus tested and the results of all five test are considered in the determination of a rating for the plastic material.
The following are noted: (1) duration of flaming after first flame application; (2) duration of flaming after second flame application; (3) duration of flaming plus glowing after second flame application; (4) whether or not specimens burn up to their point of suspension; and (5) whether or not specimens drip flaming particles which ignite a cotton swatch placed 12 inches beneath the test specimen. The highest rating given to a material is "V-0". It indicates that (1) no specimen burns with flaming combustion for more than 10 seconds after each application of the test flame; (2) the material does not have a flaming combustion time exceeding 50 seconds for the 10 flame applications for each set of 5 specimens; (3) no specimen burns with flaming or glowing combustion up to the holding clamp; (4) no specimen drips flaming particles that ignite the dry cotton beneath the specimen; and (5) no specimen glows for more than 30 seconds after the second removal of the flame.
The next highest rating is "V-1". It indicates that (1) no specimen burns with flaming combustion for more than 30 seconds after each application of the test flame; (2) the material does not have a flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of 5 specimens; (3) no specimen burns with flaming or glowing combustion up to the holding clamp; (4) no specimen drips flaming particles that ignite the dry surgical cotton beneath the specimen; and (5) no specimen glows for more than 60 seconds after the second removal of the flame.
A "V-2" rating is given to a composition (1) when no specimen burns with flaming combustion for more than 30 seconds after each application of the test flame; (2) it does not have a total flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of 5 specimens; (3) no specimen burns with flaming or glowing combustion up to the holding clamp; (4) some specimens drip flaming particles which burn only briefly, some of which ignite the dry cotton beneath the specimen; and (5) no specimen glows for more than 60 seconds after the second removal of the flame.
The lowest rating given to a material in this test is "NSE" ("non-self-extinguishing"). It indicates that the material has failed to meet one or more of the criteria for the UL-94 vertical test.
Another test for the flammability of a plastic material measures the minimum concentration of oxygen that will just support combustion. The test is an ASTM test, D 2863-70. It is carried out in a glass column wherein the concentration of oxygen is varied until that concentration is found which will just support the burning of a test specimen, for 3 minutes or until 50 mm of the specimen has burned. The test specimen is 70-150 mm long by 6.5 mm wide by 3.0 mm thick. This concentration of oxygen is called the oxygen index. A high oxygen index (O.I.) indicates a highly flame-retardant specimen.
The effectiveness of the polymer compositions herein in resisting flaming is shown in the Table below. The indicated amounts are pph (parts per hundred parts of resin).
__________________________________________________________________________
Additive    pp.sup.1 HIPS.sup.2                                           
                            PS.sup.3 ABS.sup.4                            
__________________________________________________________________________
Al salt.sup.5     20.6   20.6     24.7                                    
Ca salt.sup.5  22.2  26.6            26.6                                 
                                         26.sup.4                         
Melamine                                                                  
      27 15.sup.6                                                         
            12.sup.4        24 15.sup.6                                   
salt.sup.5                                                                
Sb.sub.2 O.sub.3                                                          
               4  4      4  4     4  4   4                                
UL-94 V-1                                                                 
         V-0                                                              
            V-1                                                           
               V-2                                                        
                  V-2                                                     
                     V-2 V-2                                              
                            V-2                                           
                               V-2                                        
                                  V-0                                     
                                     V-0 V-0                              
0.1   26.2                                                                
         33.0                                                             
            31.1                                                          
               25.9                                                       
                  20.7                                                    
                     22.7                                                 
                         23.5                                             
                            23.8                                          
                               26.0                                       
                                  24.5                                    
                                     24.2                                 
                                         25.1                             
__________________________________________________________________________
 .sup.1 polypropylene                                                     
 .sup.2 high impact polystyrene (polystyrene grafted onto                 
 .sup.3 polystyrene                                                       
 .sup.4 a copolymer of styrene and acrylonitrile grafted onto             
 .sup.5 of 5,5bis                                                         
 .sup.6 also contains 15 pph of ammonium polyphosphate
The metal or amine salt additives herein should ordinarily be used in concentrations ranging from about 20 pph (parts per hundred parts of resin) to about 32 pph. When desired, antimony trioxide may be used as a synergist in concentrations ranging from about 2 pph to about 12 pph.
All parts and percentages herein, unless otherwise expressly stated, are by weight.

Claims (4)

We claim:
1. A composition comprising a normally flammable polymer and a minor porportion, sufficient to impart flame-retardant properties to said composition, of a salt of 5,5-bis (bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane having the structure ##STR2## where A is a .[.polyvalent metal or.]. protonated amino-s-triazine group and n is an integer corresponding to the valence of A. .[.
2. The composition of claim 1 wherein A is aluminum..]. .[.3. The composition of claim 1 wherein A is calcium..]. .[.4. The composition of claim 1 wherein the normally flammable polymer is a polymer of styrene..].
. The composition of claim 1 wherein the normally flammable polymer is an olefin polymer. .[.6. The composition of claim 4 wherein the normally flammable polymer is an ABS resin..]. .[.7. The composition of claim 4
wherein the normally flammable polymer is polystyrene..]. 8. The composition of claim 5 wherein the normally flammable polymer is polypropylene.
US06/596,128 1981-07-02 1984-04-02 Flame-retardant polymer compositions containing amine salts Expired - Lifetime USRE32472E (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6617379B2 (en) 2001-12-04 2003-09-09 Albemarle Corporation Flame retardant polymer compositions

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780142A (en) * 1971-07-20 1973-12-18 Marubishi Oil Chemical Flame-retardant polyolefin compositions
US3810850A (en) * 1973-01-08 1974-05-14 Jefferson Chem Co Inc Piperazine phosphates as fire retardants for organic polymers
US3887655A (en) * 1972-05-12 1975-06-03 Stauffer Chemical Co Phosphoramidate esters of dibromoneopentylglycol
US4003861A (en) * 1973-08-31 1977-01-18 American Cyanamid Company Melamine pyrophosphate as flame-retardant in polyurethane foam compositions
US4061605A (en) * 1976-03-03 1977-12-06 Eli Simon Reaction products of benzenephosphonic acid and melamine as flame-retardant additives
US4080501A (en) * 1973-06-21 1978-03-21 American Cyanamid Company Melamine phosphate
US4098759A (en) * 1973-08-07 1978-07-04 Hoechst Aktiengesellschaft Bromine-containing cyclic phosphonic acid esters
US4143101A (en) * 1970-09-25 1979-03-06 Sandoz Ltd. 5,5-bis(halomethyl)1,3,2-dioxaphosphorinane compounds
US4201705A (en) * 1978-08-28 1980-05-06 Borg-Warner Corporation Intumescent flame retardant polyolefin compositions
US4298520A (en) * 1976-11-01 1981-11-03 Argus Chemical Corp. Phenolic ester synthetic resin stabilizers
GB2101602A (en) * 1981-07-02 1983-01-19 Borg Warner Chemicals Inc Salts of 5,5-bis-(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane and process for preparing same
US4373103A (en) * 1980-05-05 1983-02-08 Stauffer Chemical Company Dibromoneopentyl phosphate melamine salt flame retardant

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4143101A (en) * 1970-09-25 1979-03-06 Sandoz Ltd. 5,5-bis(halomethyl)1,3,2-dioxaphosphorinane compounds
US3780142A (en) * 1971-07-20 1973-12-18 Marubishi Oil Chemical Flame-retardant polyolefin compositions
US3887655A (en) * 1972-05-12 1975-06-03 Stauffer Chemical Co Phosphoramidate esters of dibromoneopentylglycol
US3810850A (en) * 1973-01-08 1974-05-14 Jefferson Chem Co Inc Piperazine phosphates as fire retardants for organic polymers
US4080501A (en) * 1973-06-21 1978-03-21 American Cyanamid Company Melamine phosphate
US4098759A (en) * 1973-08-07 1978-07-04 Hoechst Aktiengesellschaft Bromine-containing cyclic phosphonic acid esters
US4003861A (en) * 1973-08-31 1977-01-18 American Cyanamid Company Melamine pyrophosphate as flame-retardant in polyurethane foam compositions
US4061605A (en) * 1976-03-03 1977-12-06 Eli Simon Reaction products of benzenephosphonic acid and melamine as flame-retardant additives
US4298520A (en) * 1976-11-01 1981-11-03 Argus Chemical Corp. Phenolic ester synthetic resin stabilizers
US4201705A (en) * 1978-08-28 1980-05-06 Borg-Warner Corporation Intumescent flame retardant polyolefin compositions
US4373103A (en) * 1980-05-05 1983-02-08 Stauffer Chemical Company Dibromoneopentyl phosphate melamine salt flame retardant
GB2101602A (en) * 1981-07-02 1983-01-19 Borg Warner Chemicals Inc Salts of 5,5-bis-(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane and process for preparing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6617379B2 (en) 2001-12-04 2003-09-09 Albemarle Corporation Flame retardant polymer compositions

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