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Polyurethane raw materials for reactive adhesives

Reactive one- and two-component polyurethane adhesives and sealants obtain their property profile by crosslinking with polyisocyanates. Polyisocyanates determine properties like elasticity, cohesion and strength of the finished product. The large portfolio of polyisocyanates and polyols of Bayer MaterialScience makes it possible to formulate reactive adhesives for a large range of properties and applications.

The mechanical properties and the adhesion of the adhesive film are determined by:

The functionality and the molecular weight of the polyol
The type, the functionality and the NCO-content of the polyisocyanate
The number of urethane and/or polyurea groups
The crosslinking density that can be obtained in function of the molecular weight and the functionality of all components

A small selection of raw materials for reactive polyurethane adhesives

Monomeric MDI polyisocyanates

Product	NCO in %	Viscosity mPas at 25°C	approx. functionality	Molecular weight [g/mol]	Characteristics
Desmodur® 44 M liquid	33.6	4,1 (40°C)	2.0	250	e.g. for flexible packaging, hotmelts, sealants; available as flakes or fused as well, solid at room temperature
Desmodur 44 M fused	33.6	4,1 (40°C)	2.0	250	e.g. for hotmelts, sealants, prepolymer stability (++), also available as flakes or liquid, solid at room temperature
Desmodur® LS 2424	33.6	12	2.0	250	e.g. for flexible packaging, hotmelts; approx. 55 % 2,4'-MDI / 45 % 4,4'-MDI, liquid at room temperature
Desmodur® 2460 M	33.6	12	2.0	250	e.g. for flexible packaging, hotmelts,approx. 55 % 2,4'-MDI / 45 % 4,4'-MDI , color stabilized, liquid at room temperature
Desmodur® CD-S	29.5	<50	2.1	-	e.g. for hotmelts, sealants, modified monomeric MDI, liquid at room, temperature, storage stable at low temperatures
Desmodur® CD-L	29.5	<50	2.1	-	e.g. for flexible packaging; modified monomeric MDI, liquid at room temperature, near to food applications storage stable at low temperatures

To get product information on all monomeric MDI polyisocyanates please select "Products by Chemistry", then "Aromatic Polyisocyanates" and "MDI-Monomers"

Polymeric MDI polyisocyanates

Product	NCO in %	Viscosity mPas at 25°C	approx. functionality	Molecular weight [g/mol]	Characteristics
Desmodur® VK 5	32.5	22,5	2.2	290	pMDI, high 2,4'-MDI content, good compatibility with polyethers
Desmodur® VK 10	31.5	90	2.6	350	one & two-component adhesives, high 2,4'-MDI content; low PMDI content, good compatibility with polyethers
Desmodur® VK 10 L	31.5	90	2.6	350	one & two-component adhesives high 2,4'-MDI content; low PMDI content, good compatibility with polyethers, lower reactivity than Desmodur VK 10
Desmodur® VKS 20	31.5	200	2.9	390	standard pMDI for two component adhesives

Product information on all polymeric MDI polyisocyanates.

Aliphatic polyisocyanates

Product	NCO in %	Viscosity mPas at 23°C	approx. functionality	Molecular weight [g/mol]	Type
Desmodur® N 3200	23.0	2500	3.2	370	HDI, Biuret
Desmodur® N 3300	21.8	3000	3.4	680	HDI, Isocyanurate
Desmodur® N 3400	21.8	150	2.4	480	HDI, Uretdione
Desmodur® N 3600	23.0	1200	3.1	570	HDI, Isocyanurate
Desmodur® N 3800	11.0	6000	3.8	1450	HDI, modified isocyanurate

To get product information on all aliphatic polyisocyanates please select "Products by Chemistry", then "Aliphatic Polyisocyanates".

MDI prepolymers

Product	NCO in %	Viscosity mPas at 23°C	approx. functionality	Molecular weight [g/mol]	Characteristics
Desmodur® VH 20 N	24.5	280 (25°C)	2.1	350	storage stable at low temperatures, recommended storage temperature 10-30°C
Desmodur® E 29	24.0	220 (25°C)	2.2	380	e.g. as primer for flooring applications
Desmodur® PF	23.0	600 (25°C)	2.0	370	e.g. for hotmelts modified monomeric MDI, liquid at room temperature, storage stable at low temperatures
Desmodur® E 21	16.0	5400 (25°C)	2.8	720	e.g. for wood bonding
Desmodur® E 23	15.4	1800	2.1	560	e.g. for wood bonding, flexible packaging
Desmodur® E 2200/76	9.85	2750	2.0	850	e.g. for flexible packaging
Desmodur® E 22	8.6	2800	2.0	950	e.g. for the bonding of rubber pellets

To get product information on all MDI prepolymers, please select "Products by Chemistry"

Low free-monomer prepolymers

Product	NCO in %	Monomer content [wt.-%]	Viscosity mPas at 23°C	approx. functionality	Molecular weight [g/mol]	Type
MDI Prepolymers
Desmodur® VP LS 2397	5.6	< 0.15	10000 (50°C)	2.0	1450	Polyether based prepolymer, e.g. for hotmelts or flexible packaging
TDI Prepolymers
Desmodur® E 14	3.3	< 0.5	6800	2.5	3100	Polyether based prepolymer
Desmodur® E 15	4.4	< 0.5	7000	2.0	1900	Polyether based prepolymer
HDI Prepolymers
Desmodur® E 305	12.8	< 0.5	4000	2.0	680	Polyether based prepolymer, e.g. binder for rubber granules
Desmodur® XP 2617	12.5	< 0.5	4250	2.0	680	Polyether based prepolymer, for elastic adhesives
Desmodur® XP 2599	6.0	< 0.5	2500	4.0	2800	Polyether based prepolymer, for elastic adhesives
IPDI Prepolymers
Desmodur® VP LS 2371	approx. 3.7	-	approx. 11000	2.0	2200	Polyether based prepolymer

To get product information on all prepolymers please select "Products by Chemistry"

TDI-Monomers

Product	NCO in %	2,4-TDI content [wt %]	Viscosity mPas	approx. functionality	Molecular weight [g/mol]
Desmodur® T 65 N	48	67.0	3 (25°C)	2.0	176
Desmodur® T 80	48	80.5	3 (25°C)	2.0	176
Desmodur® T 100	48	> 99.0	3 (25°C)	2.0	176

Get product information on all TDI-Monomers.

Polyether polyols - Diols

Product	OH content [mg KOH/g]	Viscosity mPas at 25°C	Molecular weight [g/mol]	Acidified	Characteristics
Diols
Desmophen® 1262 BD	260	70	430	no	e.g. for flexible packaging, low molecular weight product
Desmophen® 1110 BD	112	140	1000	no	e.g. for flexible packaging
Desmophen® 1111 BD	112	155	1000	yes	e.g. for flexible packaging odorless, compatibility (++)
Desmophen® 2061 BD	56.1	345	2000	yes	e.g. for sealants or flexible packaging odorless, compatibility (++)
Desmophen® 2060 BD	56	310	2000	no	e.g. for sealants or flexible packaging compatibility (++)
Desmophen® 4028 BD	28.5	870	3950	no	e.g. for sealants or flexible packaging compatibility with PMDI (++)
Acclaim® Polyol 4200	28	980	4000	yes	e.g. for sealants or flexible packaging compatibility (++)
Specialty Polyols
Desmophen® 5028 GT	28.5	3600	4700		contains 20% PHD

SAN = Styrene acrylnitrile copolymer; PHD = dispersed polyurea; PG-1,2 = 1,2-Propylene glycole

To get product information on all polyether polyols - diols please select "Products by Chemistry"

Polyether polyols - Triols

Product	OH- content [mg KOH/g]	max. acidity [mg KOH/g]	Viscosity mPas at 25°C	Molecular weight [g/mol]	Characteristics
Desmophen® 1400 BT	400	0.1	370	420	e.g. for flexible packaging, compatibility (++), long pot life, short reaction time
Desmophen® 3061 BT	56	0.1	500	3000	e.g. for sealants or flexible packaging
Desmophen® 5034 BT	35	0.1	860	4800	e.g. for sealants or flexible packaging standard polyether, for one- and two-component systems
Desmophen® 5035 BT	35	0.1	860	4800	e.g. for flexible packaging, two-component systems
Desmophen® 5031 BT	28	0.1	1160	6000	e.g. for sealants

To get product information on all polyether polyols - triols please select "Products by Chemistry"

Polyester polyols

Product	OH- content [mg KOH/g]	max. acid value [mg KOH/g]	Viscosity mPas at 75°C	Molecular weight [g/mol]	Main comp.	Characteristics
Crystalline Polyesters
Baycoll® AD 5027	28	1.2	2800	4000	A, H	e.g. for flexible packaging and hotmelts; adhesion (+), PVC (+++), hydrolysis resistance (++), slip agent compatibility (--)
Liquid Polyesters difunctional
Baycoll® AD 1225	225	1.3	100	500	A, N, E	e.g. for flexible packaging, hydrolysis resistance (++), slip agent compatibility (+++), viscosity at RT (+), odor (-)
Baycoll® AD 2055	56	1.0	630	2000	A, H, N	e.g. for flexible packaging, adhesion (+), hydrolysis resistance (++), slip agent compatibility (+++)
Baycoll® AD 2047	55	1.0	7000	2000	A, iP, N, E	e.g. for flexible packaging, adhesion (+++), hydrolysis resistance (++), slip agent compatibility (+++), viscosity (-)
Desmophen® 1700	43	1.5	17500	2600	A, D	e.g. for flexible packaging or hotmelts, compatibility(-)
Liquid Polyesters higher functional
Baycoll® DV 1245	234	2.0	2950	-	hydrophobic; fatty acid based	For two component adhesives
Baycoll® DS 1165	155	2.0	3500	-	hydrophobic; fatty acid based	For two component adhesives
Desmophen® 1200	165	4.0	23500	1000	A, oP, T, P	e.g. for flexible packaging, adhesion (+)
Desmophen 670	141	2.5	3100	1260	A, iP, oP, T, H	e.g. for flexible packaging adhesion (+++), aluminum, polymers hydrolysis resistance (++), slip agent compatibility (+), reactivity (+)
Baycoll® AV 2113	109	1.0	650	1650	A, H, P, T	Good adhesion to PVC, hydrolysis resistance (++), slip agent compatibility (+)
Baycoll® AS 2060	60	2.0	1000	2530	A, D, T	e.g. for flexible packaging compatibility (-)
Polycarbonate polyols
Desmophen® C 1100	115	0.1	3500 (23°C)	1000	H, EC	Hydrolysis resistance (+++), light stability (+++)
Desmophen® C 1200	56	0.1	16500 (23°C)	2000	H, EC	Hydrolysis resistance (+++), light stability (+++)
Desmophen® C 2100	112	0.15	450	1000	H	Hydrolysis resistance (+++), light stability (+++)
Desmophen® C 2200	56	0.2	2050	2000	H	Hydrolysis resistance (+++), light stability (+++)

A =adipic acid; oP =orthophthalic acid; iP =isophthalic acid; tP =terephtalic acid, B =butanediol-1,4; D=diethylene glycol; E =ethylene glycol; H =hexanediol-1,6; P =1,2-propanediol; T =trimethylolpropane; N =neopentylglycol; MA =maleic anhydride; DO =dodecanedioic acid

These products represent just a fraction of our entire product range. If you do not find a suitable product for your application, our experts are happy to assist you with a recommendation.

Additional information on raw materials for reactive adhesives in these materials:

Presentation for FEICA, Sept. 2008:
"New PU-Raw Materials for Adhesives and Sealants without R 40 labeling" (englisch)

Brochure: Prepolymers - Products & Applications

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