# US 11,999,155 B2 · Spunbonded laminate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,155 B2 - Document ID: US11999155B2 - Status: Granted - Kind: B2 - Application number: 17/589,386 - Filed: 2022-01-31 - Published: 2022-08-04 - Granted: 2024-06-04 - Earliest claimed: 2021-02-01 - Assignees: Reifenhaeuser GmbH & Co. KG Maschinenfabrik - Applicants: Tobias Wagner; Sebastian Sommer; Patrick Bohl - Inventors: Tobias Wagner; Sebastian Sommer; Patrick Bohl - Web page: https://patentgrep.com/patent/US11999155B2 ## CPC - B32B 5/267: {characterised by at least one non-woven fabric layer that is a spunbonded fabric} - B32B 5/022: {Non-woven fabric} - B32B 37/10: characterised by the pressing technique, e.g. using action of vacuum or fluid pressure - D04H 3/007: Addition polymers - D04H 3/018: characterised by the shape - D04H 3/147: Composite yarns or filaments - B32B 2250/20: All layers being fibrous or filamentary - B32B 2262/0253: Polyolefin fibres - B32B 2262/124: Non-woven fabric - B32B 2262/16: Structural features of fibres, filaments or yarns e.g. wrapped, coiled, crimped or covered - B32B 2307/718: Weight, e.g. weight per square meter - B32B 2307/72: Density - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) ## Abstract A laminate has first and second spunbonded nonwoven layers at least one of which comprises or consists essentially of crimped continuous filaments that are bicomponent filaments having a first component based on polypropylene and a second component based on polypropylene. A specific density ρ (g/cm3) of the spunbonded nonwoven laminate depending on the surface density of the spunbonded nonwoven laminate lies below a density limit ρG defined by the following equation: ρG=9 cm−1×surface density g/cm2+0.0393 g/cm3. ## Claims ### Claim 1 A laminate comprising first and second spunbonded nonwoven layers wherein at least one spunbonded nonwoven layer comprises or consists essentially of crimped continuous filaments that are bicomponent filaments of core-sheath configuration and having a first component based on polypropylene and a second component based on polypropylene, a specific density ρ in g/cm3 of the spunbonded nonwoven laminate depending on the surface density of the spunbonded nonwoven laminate lying below a density limit ρG defined by the following equation: ρG=9 cm−1×surface density g/cm2+0.0393 g/cm3. ### Claim 2 (depends on 1) The laminate according to claim 1, wherein the first component consists or substantially consists of a polypropylene mixture or consists or substantially consists of a polypropylene copolymer. ### Claim 3 (depends on 1) The laminate according to claim 1, wherein the second component consists or substantially consists of a polypropylene. ### Claim 4 (depends on 1) The laminate according to claim 1, wherein at least one spunbonded nonwoven layer of the laminate comprises crimped continuous filaments having a titer of up to 2 denier. ### Claim 5 (depends on 1) The laminate according to claim 1, wherein the first component is the sheath and the second component is the core. ### Claim 6 (depends on 1) The laminate according to claim 1, wherein at least 25% of all the continuous filaments of the laminate are crimped continuous filaments having an eccentric core-sheath configuration. ### Claim 7 (depends on 6) The laminate according to claim 6, wherein, in the crimped continuous filaments having an eccentric core-sheath configuration, the sheath of the filaments has a constant thickness D or a substantially constant cross-sectional thickness D over at least 20% of the filament circumference and a thickness of the sheath in the region of its constant or substantially constant thickness D is 0.1 to 4 μm. ### Claim 8 (depends on 1) The laminate according to claim 1, wherein the laminate further comprises a third spunbonded nonwoven layer lying on an outer side of the laminate, at least one of the spunbonded nonwoven layers comprising crimped continuous filaments having an eccentric core-sheath configuration and including continuous filaments of a titer up to 2 denier. ### Claim 9 (depends on 1) The laminate according to claim 1, wherein at least one of the spunbonded nonwoven layer comprises crimped continuous filaments with side-by-side configuration. ### Claim 10 (depends on 1) The laminate according to claim 1, wherein the laminate has a surface density of 10 to 40 g/m2. ### Claim 11 (depends on 1) The laminate according to claim 1, wherein the first component comprises at least one polypropylene copolymer that has a fraction of the co-monomer of 1 to 6 wt. %. ### Claim 12 (depends on 1) The laminate according to claim 1, wherein the first and the second component have different melt-flow rates and the continuous filaments have a core-sheath configuration and the second component forms the core component and has a higher melt-flow rate than the first component forming the sheath component. ### Claim 13 (depends on 1) The laminate according to claim 1, wherein a ratio of the melt-flow rate of the second component to the melt-flow rate of the first component is 0.9 to 2.2. ### Claim 14 (depends on 1) The laminate according to claim 1, wherein a ratio of a polydispersity index of the first component to a polydispersity index of the second component is 0.9 to 1.4. ### Claim 15 (depends on 1) The laminate according to claim 1, wherein a melting temperature of the first component is lower than a melting temperature of the second component and a difference between the melting temperatures is 0 to 20° C. ### Claim 16 (depends on 1) The laminate according to claim 1, wherein the second component comprises at least 1000 ppm relative to the total filament of at least one lubricant.